No coverage billed which should have been waived and now account is suspended

i had taken out a MTN home wifi contract whilst living in JHB, from the start there were issues with low speed, buffering etc, i then relocated to Secunda the last week of January 2026 and the Home Wifi wasnt working, i called MTN Customer Service and they changed the address to the new address, the router worked for about an hour and then stopped, the end of January on a Saturday i went into the store in Secunda and they then changed the address again on their system, it never reconnected that day, the next day, Sunday, i went back to the same store and they changed it but it kept reverting back to the old address, they then told me i had to go to the branch i took the contract out, the begining of February i went to Carnival Mall branch where i took out the contract and they told me as per customer services there isnt coverage in the area, i then handed in the router and sim card that same week to them, they told me they need to get a no coverage letter and then they will cancel the contract, after 2/3 months of continuous follow up we eventually got the no coverage letter, the contract was cancelled but now i had still been billed for those months, now every month my line gets suspended because the bill that was supposed to be cancelled was moved over to my existing line, i have continuous fights with the Carnival Mall branch as multiple tickets have been opened but nothing gets resolved, i have now had my existing line suspended for nearly a month with promises made that more tickets have been escalated BUT NOTHING happens further, this is a frustrating inconvenience for me making me very negative about the whole situation as i have been a loyal client to MTN for YEARS. i need the billing for the months that i never used the wifi because of no coverage to be waivered and my account suspension to be uplifted as i cant make calls or utilise my phone