Aftican Bank - Horrible Service & breach of contract

I app**** for a credit card and got provisionally approved over the phone. I sent the supporting documents and was advised via email that I'd been approved. I then received a call for voice contracting which was done and terms and conditions were explained and accepted. I was advised via telephone and email to visit the branch to collect my credit card and that funds will be available within 24 - 48hrs. I visited the branch and got issued a credit card and a debit card for a savings account and got registered for online banking. A day later I received an email advising that my application has been declined.

African bank had a signed credit card agreement contract with me to provide the service and they decided to back out of the contract after issuing me a card. I lodged a complaint with them disputing the cancellation of the credit card agreement, apalling service, breach of contractual obligation as well as unfair customer treatment and was given reference number *** on 11/04/2022. Up until now I have not received acknowledgement of my complaint. I need to get an urgent outcome so that I can take this up with the Ombudsman if they do not rectify this.