And now they telling me that your funds may be lost because we can't do nothing and revert transaction can take several month...I know how works ETH blockchain and no problem send receive USDT ERC20 token in ETH. They fooling me now about - "several month to recover" and probably your funds lost...
What to do?
I have seen such problems in the past involving users sending tokens to wrong exchange addresses. In such cases, I am yet to see a user get back their lost funds from an exchange. The response you got is the very response other users in your shoes have been getting over the years.
You are now at Blockchain.com support's mercy, no one out here can help except them. You have no choice except keep bothering them and pray they decided to recover your money "after several months" rather than ignore your messages.