BAD Service- WORSTS EXPERIENCE EVER

I have been trying since the 4th of December to get my refund paid back to me, after I was double billed. I was asked more than 10 times to provide proof of payment, endless emails send to the Customer Service call center. Call more times that I can remember the call center number , spoke to 3 team leaders and supervisors, each one telling me a different story. I requested on email for the money to be paid back in my personal bank account, I called again S Mbambo told me "it look like the money went into your Cell c account. I said I specifically asked you to pay the money into my bank account. I called again yesterday. Professor ( call center agent) told me the money was paid to me on the 10/12/2018. I asked him to send me proof, he send me an email with no bank account number on , he could not even see that the reference number he send was the Billing number. I called again spoke to Samukalisiwe, who was adamant that the money was paid into my bank account. I called the bank who assured me that no deposits were done from Cell C. I called again this morning and spoke to call center agent Thabiso, who could not see any refunds but will ask his manager Phumzela to call me, that was at 10h30 this morning. One of the managers Busisiwe took my banking detail more than two weeks ago and she said that she will do her best from the back end to make sure the money will be paid back. That was just empty words. I called again to speak to the manager/team leader S. Mbambo who said he will send another email to the "people" to pay the money back into my account, I asked to speak to the "people " and was told no I cannot. I have never came across such bad service, and will definitely not recommend Cell C to anyone. The call center staff including team leaders and managers need to go back for Training, because they have no knowledge of how to assist clients. I have spend so much money on phone calls, that even my colleagues were telling me to cancel the contract!