FNB Credit card payments don't work.

I tried to make an online payment using my VISA card. It was declined. I went onto the FNB chat on the App. They suggested i phone the ***** line. Called them and they said they had to lift a restriction that is in place to protect me from *****. They told me to wait 5 minutes and try the payment again. I waited 10 minutes and still the payment did not go through. I phoned back. The system asks you to enter your phone number. It doesn't recognise my phone number. When I spoke to an agent again i had to give my full credit card number over the phone. This is not secure. Bongani couldn't figure out why the transaction wouldn't go through. He said he would have to call the first person I dealt with and call me back. This bank is not what it used to be. I phoned a third time a spoke to Kyle the first person who supposedly lifted the restriction on my credit card. He lifted the restriction again and waited on the line for me to try again. It still didn't go through. This is ridiculous. A VISA card on a VISA accredited site and it doesn't work. What is the point of having a credit card if you can't make a payment to an accredited vendor and nobody at the bank is able to help me. It will be interesting to see how FNB is going to assist me after this complaint.