I am aware that I made a mistake, but I am still surprised that they do not want to credit the deposit, despite the fact that
1. They have done so before in the case of this type of mistake
2. It is a BEP20 network that they support on USDT, and the deposit address for USDC ERC20 is the same.
3. This deposit would not even cover 1/3 of today's losses on this site.
Since you said you have made this kind of mistake before and they helped you, this time around, take it that this is them telling you "hey we've helped you before, you won't be lucky next time".
The error you committed the first time is assumed to be a mistake. Repeating such mistake the second time is carelessness. The money is gone and Duelbits won't be held accountable. Go and learn your lessons.