Maybe time to leave FNB?

Today is the 2nd time that when i tried to make a purchase on my Credit card it was declined due to wrong PIN number and eventually blocked. The PIN number i used is definitely the correct one as it is the one displayed as my PIN on my banking app.

The 1st time i had to phone FNB and the lady fixed the problem but it happened again today.

When is this problem going to be fixed? I had to make alternative arrangements for the payments and hence lost my eBucks on both these transactions.