There must be something going on. Otherwise, an account will not be blocked or locked for so long. By the way, if you place a bet with a bookmaker, it seems to me also the responsibility of the player himself to keep track of the bets placed. Maybe he made screenshots of it? Or can he at least tell you which bets he has placed, on which sport and which competition plus the stake for example. 1xbit may be busy with the support department at the moment.
Am genuinely surprised to see you promoting 1xbit. Anyway, to answer your queries, 1xbit has a history of locking or blocking accounts for an indefinite time period stating several bullshit reasons to seem legitimate.
Also, if you place hundreds of bets on a regular basis, would you take screenshots of every single one of them? Think before typing such nonsensical garbage.