Absa not rectifing my account

I made payment into my absa bank account using the bank details and reference number they provided. That was done on 20 December 2018. To date the money has not been allocated onto the account. I have asked for feedback and sent the proof of payment, no one gets back to me. I just get calls asking for the money. This is ridiculous. I have sent the payment proof 4 times and absa still has not updated my account. Which clearly impacts my credit record. And no one at Absa contacts me.