@Francise - I don't know if this is maybe just due to some type of language barrier for you, but if there is some type of lead fraud going on, then "low quality traffic" is not the type of terminology you want to use with your publishers.
Many people are either not going to understand what that means, or they are going to think it has something to do with the leads IP (country) and/or referring domain(traffic source). There should be no other wording for it except for FRAUD.
Anyways, I'm not saying Aaditya is or isn't a fraud, but I think if MediaKings were scammers there would be a lot more people complaining about it. Plus, wouldn't you think they would want you around to generate more money via their advertisers? Not to mention, there would be a lot more better ways to scam you without even knowing, like lead shaving.
In some cases too, this could just be a mixup with the statistics. I seen a shitlist the other day (now deleted) where someone was having a similar issue with another network. It turned out, after getting the statistics from the network, the IPs were showing incorrectly as the advertisers IP and user-agent.
I suppose it's possible too that someone savvy and maliciousl could come across your landing page and decide they want get you in trouble with your CPA network by running a botnet to get you a bunch of fraudulent leads without you even knowing about it.