How to prove fraud in Yandex.Metrica?

Question

Yandex.Metrica

Good afternoon.

During the promotion of one of the automotive sites, different traffic sources were used. The site itself is almost one page. One of the sources shows an abnormal number and quality of visits, highlighted anomalies on the screenshots - including gender (for "women" the quality is many times higher, although the site is about cars), and most importantly, the number of visits made by one user can be seen on the screenshots, that 40 people brought over 4000 visits with unrealistic quality both for the site and in comparison with other tools.

QUESTION:how to hit the traffic source correctly and what objective evidence can be provided that this is a fraud? There is only one reaction to the current arguments - "mistakes in defining visits as a metric." The volume is large enough for this promotion and I really don’t want to stupidly drain the budget.

Answer 1

It is better to immediately stop working with such sources . But if there is normal traffic from the source, then you can think about how to fix the situation.
As I understand it, this is some kind of contractor that brings you traffic through links from their sites? And you pay for traffic, so it is important for you to prove that it is a fraud?
In this case, in order to avoid budget drain, you can work with a source with payment for targeted actions on your site (payment for registration or for an order). Better yet, switch to a payment system for all subsequent orders (revshare model).
But if this option is not suitable, then you can do it differently:
There are companies that place their script on the site and collect information on traffic (technical and behavioral parameters).
Knowing this data, you can block traffic with certain parameters from going to the site. It works like this:

• For the context (Yandex or Google), a custom audience is created, according to which bids are adjusted
  
• For organics, the transition is prohibited at the server level
  

Thus, if the source sends such traffic further, it will not reach you. In the metric you will not have it either. Tell the source that you don't have traffic, you won't pay. You don't believe me - here is access to the metric for reading, try to find it)
ps I did this when I bought a lot of traffic from different webmasters. Then it turned out not bad to clean up the traffic in this way + protected from parsing your site additionally. If anything, I'll throw off, upon request, I'll throw off links to companies that analyze traffic.