Telkom refuses to pay back my money.

I started a contract with telkom in February 2024. My first payment was supposed to begin on the 25th of March 2024. The payment didn’t go off. I made an EFT payment from the Telkom Mobile App of R1238.00 on the 5th of April. I received messages that my account is in arrears. I made several follow up calls and emails with 3 different consultants. I was informed that they would allocate the money to my account of which was not done. On the 25th of April, I made an EFT payment of R1140.00 which is the monthly instalment for my contract of an IPhone 15 pro. On the very same day, my account was debited with an amount of R1783.50. I contacted Telkom and I was informed that my first payment of R1238 that I made on the 5th of April has still not been allocated however, they are busy sorting it out. I sent my bank statements as per their request as well as a statement from the Telkom mobile App showing that I made a payment. I called and was informed that they would refund me the amount of R1783.50 of which has not been done. There is no communication whatsoever from them. They do not respond to my emails and they are forever telling me that the 1st amount has still not been allocated. Basically, I paid my instalment twice in one month and I’m not getting my refund.