The business docs you submit, needs to match with all the campaigns that have ever ran in the Google Ads account. Example, if campaigns have run for watches and the business docs you submit pertain to a restaurant, then no matter how many attempts you make to verify, it will be rejected by Google. If you are a 3rd party (affiliate, etc) of a product or service for a campaign that has run in the Google Ads account, then also submit some doc(s) pertaining to you being authorized to sell that product or service. Nowadays, the business docs verification part, is done manually (by human beings) by Google Ads. Everything you submit must ideally match with the campaign (website included) that have ever ran in the Google Ads account, if not, then passing the business docs verification part will be a tricky affair or a mission (almost) impossible.