MTN - do not get there wifi

Took out a month to month MTN home wifi router returned it and still battling to have it cancelled after MTN customer care received the router in Nov 2024. They failed to cancel the contract and after many email and phone call attempts back and fourth front 1 department to the next the contract according to them was only canceled in June and theny have now listed me at the credit bureau for not having paid an installment for May 2025. But my Jill was settled in25 Dec 2024 and i sent the bank statement and everything but they are addament that I owe that month after the router had been off since September and it clearly states if you do not pay you do not get any data for that month and pay in order to receive data again. Funny part is there are emails back and forth to different departments and the 1 email says that a credit must be passed but yest the customer care agent on the mail just says you have to pay without even knowing the history of the complaint. I have asked on numerous occasions for the call to be escalated to a manager but nothing. With all the automated services and emails they just do not even worry. If you line is bad or the call goes off they don't even call you back and they simply not bothered because you get anew person evertime you call so no one takes any accountability for anything they just shove to the next person without even complaining.