MTN issue still not resolved.

Thank you for assisting me but I am still not getting any joy with MTN Westgate Mall I spoke to the manager Shameema or something and she is telling me that the human error the consultant (Kanya) made cant be reversed as my credit is not enough even though the contract was signed and sealed on the 10.07.2021. I can not accept what she is telling me I am very sorry. This is very bad service from MTN telling me 6 moths later that my credit score is to low. Please advise what other steps can be taken as I have a binding contract with them therefore I don't default on payments and I expect them to honor my signed contract and give me what I signed for and what I pay for. Regards Haniefa Marlie