Fed up vodacom customer

I purchased an Iphone 11 on the vodacom online store on 25/03/2023. I bought the phone on vodacom online as the shop in the mall said that they could not order it for me. It was a once off non contract cash transaction. When they delivered the phone it was faulty and would not switch on. I phoned customer care to return the phone but they could not help me. I went to the nearest vodacom store, Chatz Connect Potchefstroom, and they helped me send back the phone for repair or replacement. The device was accepted as OBF (out of box failure) and I was told that I would receive either credit or a new phone, either delivered to me or the store I took the phone to to return it. The store was however told that they can't receive the credit as the phone was purchased online. They gave me an R number and account number and they said they were told that I had to call customer care or after sales and give them the information and they would be able to help me. I have however phoned and emailed for over 3 weeks and have been directed to different numbers in customer care and after sales and no one can help me. At this point I am very frustrated and don't even know who to contact to help me resolve this issue.