No one here closed your case as we are members like yourself with no access to your account.
You have not explained the reason for the return so it's hard to give you a correct answer.
A case can be closed for a number of reasons .
Did you open it past the 30 day deadline?
Was it for a return for item doesn't fit / change of mind? If the seller has a No Returns policy on their listing, they do not have to accept a return for those reasons.
Did you forget to escalate?
As said hardto say with little information.
@rawabdu-97