Mtn disgusting service no help

I cancelled a contract that ended on the 16 november 2023, i emailed the retentions team and i also called the 135 number i spoke to a female and told them to cancel it as the contract came to an end. The contract was not cancelled it went on a month to month bill and the premium went up from 300 some change to almost 1600 per month. I went to the cornobia mtn to find out whats going on the guy told me the promotional contract amount is over and because the contract was not cancelled the new amount is 1600. He stated he will raise a complaint however to date no feedback i stopped the debit as this premium was unaffordable. I emailed the complaints team and to date no feedback. I have been with mtn for years and was so faithful to mtn. I want a compliance officer to investigate my case, listen to all voice recordings and trace back my emails.I need this fixed and the arrears cleared off. I cannot take calls in the day please email me i will respond via email. I want to he compensated for my name and credit scoring being affected as well. If i do not receive a response in the next 7 days i will seek help from the ombud.