Awful Service from Payflex

Awful servoce from Payflex, I have been struggling to change my contact number on Payflex,I have reached out to the customer service centre and have sent through supporting documents and even took selfie and sent my ID copy to them via email however I am sent from pillar to post for the past 2 months,just to change my contact number,no one seems to know what to do just to update my contact details,even after verifying 50 times