Extremely bad service

In March I went to Maponya Mall telkom to add a device on my contract after I lost my phone. The agents were very unfriendly and rude they pass you around like you doing a favor to be at the store with the manager always not available when you request for management so I let that slide. My serious issue ryt now is that MotheTP the agent that assisted me did not do a device add on but did a separate contract with standard Bank details. I do not have a standard bank account and the bank statement i gave her is Capitec Bank and she so did not follow through all my requests as she had no time to service me. I had to come back in April to add minutes that I had asked her to put on my new device, still the manager was not at the branch. I have been back an forth with help desk as I was trying to find out why my account has been in arrears till I asked them on the 6th of July what was happening on my contract that's when I discovered wrong banking details have been used for this contract *** I then requested they change to capitec which happened without a hustle. She then logged a case for me to be refunded all the insufficient charges from ***6 of which till today its still not resolved. This has caused a major negative impact on my credit bereau because of her negligence and incompetence.