In my experience, very often in conflicts between technical support of exchanges and users - it turns out that the user himself made a mistake ... Although there are exceptions ...
But almost always the users themselves are to blame for their problems.
Here the situation is this, from two sides, that is, the error can be both from the side of the user and from the exchange, but the situation needs to be examined in more detail
If there are experienced people, then you can close this question, you just need to contact the exchange administration directly and decide everything as it should, i dont think there are hopeless situations