you look like scamming material (just like I used to be several years ago when I jumped from one scam to another)
You need to learn how to crawl before you walk, and to walk before you run. That is, first learn how to index your sites (that's not always up to you unfortunately), then learn how to rank a website without any backlinks, and then learn how to rank a website using backlinks. All of these while educating yourself about backlinking because I do have a gut feeling that you don't even know which backlinks to get, which pages to point them to, with what anchor texts, how often to build links, and so on... And all of these steps are extremely important to get right for new sites that have no backlinks yet.
Another thing... how do you know that your websites have "bad spam score"? Spam score is a metric invented by MOZ, and it's irrelevant in SEO. I mean, if you do have a high spam score and do nothing to lower it then it could definitely be bad for your site. But you said that your sites are new and I assume that they have no backlinks yet, and if they have no backlinks they can't have a bad spam score because spam score is given by shitty backlinks. So, how do you know that your sites have a bad spam score??
The third thing... you could build sites all day long, for all eternity, and you wouldn't see any traffic or make any money with any of them until you proactively took steps to... first index them, secondly rank them, and thirdly monetize them. I know this because I've been just like you... for 6 years straight. I used to build amazingly stunning websites, put 5-6 articles on them, and then do nothing because I trusted google would flood my sites with traffic because of how pretty they are. Even today I still do this dumb shit, I can't stop building pretty sites on great looking domain names and doing nothing with them because I dread doing the hard work. Don't be like me! If you're serious about making money, just build 1 or 2 sites (until you learn how to make them profitable, after that you can scale up) but spend your time ranking and monetizing them. It will be hard work, yes (or you can outsource it to real pros if you have the money), but it's what brings the money in. Building pretty, shiny websites does no one no good, you can take my word for it
Anyway, I apologize for the long dissertation (and possibly unwanted advice), but this was needed to save you from yourself because I do feel that you're exactly like I used to be, and that's not good. It might lead you to years of your life wasted for nothing.
So, my recommendation is that you politely decline your SEO provider's offers of backlinking until you learn how to...
1) first, pick a niche that you can rank in (not easy to do, but crucial to your future SEO efforts)
2) secondly, find some keywords that you can rank for (preferably without backlinks, but if that's not possible at least find keywords that are profitable and have high volume to justify the effort and time you'll put into ranking for those keywords)
3) create content that ranks (after the latest google update that had rolled out last week the content should be highly unique, AI or humanly written it doesn't matter too much, it just need to be unique and of decent quality)
4) index all of that rankable content
5) (optional, and only if needed) start building links after giving the INDEXED content 1-2 months of time to stabilize in the SERPs. If after 2 months after the content had been indexed it's not even in top 100 you'll know that you've either picked a tough niche, or picked tough keywords, and at that point backlinks might be your only option... have your websites been built and set up properly beforehand, that is...
To learn how to do niche and keywords research properly have a look at these guides that have posted by some of our members:
https://www.blackhatworld.com/seo/how-to-do-keyword-research-for-free.1380646/https://www.blackhatworld.com/seo/guide-how-to-find-easy-to-rank-low-competition-keywords.1407283/https://www.blackhatworld.com/seo/niche-hunting-the-definitive-guide.1390428/https://www.blackhatworld.com/seo/method-find-super-low-competition-keywords.1388137/https://www.blackhatworld.com/seo/m...ord-research-guides-methods-from-bhw.1381923/
To learn how to optimize your content for google (paramount to do, otherwise you'll never rank for your desired keywords), read this guide by
@splishsplash :
https://www.blackhatworld.com/seo/guide-full-example-of-how-to-do-on-page-seo.1251425/
I've not reviewed the guide lately, and some things might have change after the last several crazy months in which google have released so many updates, but the guide should still hold true overall, so make sure you read it!
I'm not linking you with any guides on backlinking as I've not bookmarked any of them yet, and I don't have the time to look them up at the moment. Just use the search button to find them, I'm sure there are plenty of topics on the biggest SEO forum on the planet that cover backlinking. Or search my profile for my postings, I do remember to have made a few replies this year alone that addressed backlining