FNB refuses to help because I won't tell them my ABSA credit card limit.

five days ago I had a problem with purchasing online as the OTP was not working. after calling 4 people I found a consultant who could help. One of the authentication questions was: what is the credit limit on your ABSA credit card? I refused to tell them and FNB refused to fix their OPT problem. Kanjane? In what world is it acceptable for one bank to ask private information about a different bank and refuse to help because I refuse to give them that private information? I then contacted *** who simply did not care. I got some silly response about "that is our system". Obviously it is your system, and your system is WRONG to ask those kind of questions. In short, terrible experience with the consultants, the FNB system and the "care" system. Problem is still not resolved 5 days later. Why am I with FNB again??