Hello to @marcloig  and all interested.
We have finished investigating the case.

I have got in touch with the security department one more time regarding the reason of the account disabling. Still, the reason is following:
"Should the bettor commit fraud in respect to the bookmaker (such as the registration of multiple accounts, the use of automated betting software, arbitrage betting, if the betting account is not used for betting, the improper use of loyalty schemes, etc.), the bookmaker reserves the right to stop such fraudulent actions by:
-bet cancellation;
-closure of the customer’s account. Money that has been deposited into the account will be refunded.
-filing a claim to a law-enforcement agency."

We did trace connection with the so-called friend's account. Although many users here are interested in the details how the security department detects such connections, this data is considered to be vulnerable and is thoroughly preserved. Thus, we prevent the emergence of new fraudulent schemes by keeping our security tools in secret. The MegaPari team is always open to your questions, until they do not intend to disclose the company's confident information.

By placing bets, players must understand that gambling authorities are ALWAYS in touch with their colleagues from other casinos and bookmakers. We share a competitive market, but when it comes to analyzing players activity, its security departments do trust their colleagues opinion and information provided by them. So the player is "well-known from other platforms".

This also serves well as a reasoning why the player blame MegaPari to be somehow similar to 1xbet, 1xbit and any others - if the player is blocked there, he will more likely be blocked in other gambling establishments. And not because we share business or the same platform - the process of how players' activity and profile is being analyzed by the security dept is much more sophisticated. According to my experience, all new players who come to the MegaPari ANN thread and open complaints - they all got blocked acc. to the reason expressed above and not only at MegaPari. It is cooperation against unfair gambling activity.

We will consider this message as our final word. The player is free to give this case a further move, if he is sure that a third-party investigation serves for his better.