MTN Service so frustrating

am writing to you so frustrated of your guys processes , today I was at Lakeside Mall MTN in Benoni and wanted to get reconnected to my home Wi-Fi and unfortunately could not be assisted because I was told my contract was terminated and I have a debt to pay which included this router of which I disputed that and confirmed that I may have a little amount to pay in after you guys deduct the router amount . I returned /gave them the router today and have proof of return with the *** number assisted by *** at the Benoni Store a very lovely lady . When calling the *** number I am put from one person to another and no one seems to know what they are doing , your legal department I get sent to NU-DEBT is claiming my profile doesn't exist on their system when they punch in my *** . So please kindly close this account immediately wherever it is ?? and issue a clearance letter since the router has been handed over , if MTN cannot help me again with the home Wi-Fi Situation