This is obviously my mistake, but I was surprised that the website rejected my request to credit the funds.
Why are you surprised? You made a mistake and now you are surprised?
A similar situation happened to me on this website before (identical networks) and I received the funds without any problems. This time, they decided that due to my mistake, the deposit would not be credited and that was it.
What are the chances that if they help you once again, you will continue making the same mistake? Maybe you should pay more attention to the addresses and warnings next time. It's not that hard by the way.
I am extremely disappointed with their attitude, especially considering that the deposit address for USDC BEP20 is the same as for USDT BEP20, which they support, or USDC ERC20, which I should have credited, so they certainly have the capability to do so.
Addresses may be the same, but those are two different smart contracts?