shocking customer service

I have an Absa Credit card. I noticed on my internet banking that I had no credit available and that an amount was transferred to Visa. I contacted Absa Card division and was told that Mastercard was no longer and that new Visa cards would be issued. To date I have not had any correspondence advising me of this nor has anybody contacted me to deliver the new card. This could have caused me embarrassment if I had tried to use my current credit card as it would decline. This is totally unacceptable customer service and I am really unhappy with this. Surely clients should have been advised about the change over,.