2Pot claims failure

I have tried multiple times to withdraw from my 2pot via WhatsApp with no luck, keep receiving message can't validate banking details. Have called customer service multiple times they do not have a reason for this happening and the only feedback is try again. I have emailed a withdrawal claim only to follow up and hear the process takes 15 days but to please try and submit via WhatsApp again. It seems like the staff has not been fully informed on the current status of this process. Extremely dissatisfied with the service and I always thought momentum was a good company.