Credit card limit removed without any notification

Tried to use my credit card yesterday and it kept declining. I used the FNB app to chat to an agent, who told me to call the KYC helpdesk. We phoned the number provided and were told that the profile had been updated, but that we now needed to speak to FNB credit card department to reinstate the credit limit. Tried to call FNB Credit Card and got through to an agent who then dropped the call. Not only has this service experience been terrible, but why on earth do your accounts get blocked and credit limits removed without ANY notification from the bank whatsoever! This is shocking.