Contract upgrade without authority

I tried to upgrade my contract on Monday after around a year and a half of my last contract expiring. I was on a month to month contract with MTN (well that's what I thought). I was told by the call centre that my contract was upgraded last November and that I have a year to go. This was news to me. All I asked for was a month to minth contract until I am ready to upgrade. I've been calling MTN this entire week to try and get details, etc. I wasted over 240 minutes of my life which I will never get back, trying to get a copy of the recording where I so called agreed to the new 24 month contract. I spoke to over 7 consultants: Zola, Mzu, Sipho, Sli, Nishan, Samuel, to name a few. These people are based at the call centre (808), retentions dept ********** ), MTN Summer dept, Sales Dept. Zola even told me that my contract expired on 28th November this year and that I should go to a MTN store as only they would be able to help. I called back to confirm and the next consultant says my contract expires in November 2019. I still don't have details, I still don't have a copy of the voice recording and I still don't have a copy of the agreement. I need details!!!!!! I've been a customer of MTN from 1999 to date. This type of service disgusts me. There's many other companies like yours MTN, who are crying out for business. I await a response!!!