For some suggestion for me, contact their support again to inquire about the delay. It's essential to maintain open communication with the exchange to resolve the issue. However, I would advise against threatening a lawsuit immediately. Instead, try to exhaust all possible communication channels and escalate the issue within their support team if necessary. If you still don't receive a satisfactory response, then consider seeking legal advice. It's crucial to remain professional and patient while dealing with such situations to increase the likelihood of a positive outcome.