Poor service

I had a contract with Mondo/ MTN. It was meant to be a three years Contract opened 19 July 2021 but I complained that the package wasn't according to our agreement. Amanda and Vicia from Mondo helped me to resolve the matter after many efforts and they said the contract is closed and I am not going to pay anything because the Contract was invalid(28 November 2021)

In July 2024 last month, I tried apply for credit but results came saying I have not being paying well in the past 12 months. Experian shows that I owe MTN R1110.00 Status ... open/Current Adverse code ...handed over Account number ...BA*** Adverse date ...31 January 2024

At mtn was told to pay R3246.17 before Amanda and Vicia could assist