A scary sidenote: After waiting for 5 days, I tried contacting them on Discord, wich led me to get banned within 1 hour of asking in their "General chat"
Delaying the withdrawal without any explanation was obviously a wrong thing. Where the most worried part is that you got banned from their discord chat by asking about your withdrawal. They should have given a reasonable explanation for withholding your withdrawal. I have informed
Baryom about this on telegram (although the chance is quite low to get a response from him as he is inactive here).
Well, if what you said is true OP, then there's really something fishy going on with Bitsler. But to be honest, I believe Bitsler is a reputable casino, so if they actually did it to you, then there might be valid reason for that. The problem is, based on what you've said, you never received any explanation. So maybe ask some other Bitsler users if they also experience the same issue. That way, you will know if it was just a coincidence or they're really up to your funds.
Make sure to DYOR as well. Read some feedbacks from previous gamblers who have been gambling with this casino.
Possibly, something might likely be wrong somewhere which the casino is not letting known publicly because a big casino of that nature should be able to respond to their clients immediately without any further delay to releasing their assets or funds when on a clear stand but it is obvious that they had delayed the release of OPs funds which raised suspicion and as advised, it would be better to ask other users as well to confirm if an they are experiencing similar occurrences. This would better give insight and clues on what is happening