Validation error with transfers between accounts - no assistance

I have used Nedbank for years with no problems. I have always used my internet banking and app to transfer between my accounts even though my actual card expired July 2019. Now i suddenly have an validation error when trying to transfer from my credit card to my current account. I phoned the call centre and did a chat through the website and both consultants advised me that i cannot transfer as the credit card has expired. This makes no sense to me as I as the account is still active and almost paid up. I need to make payment on an account urgently with my credit card. Any assistance from Nedbank would be appreciated.