Disgusted with MTN service

I have never been so disgusted with customer service as much as I am with MTN.. My 24 month contract expired and I didn't want to upgrade. My fixed bill was R319 p/m and I was informed that it would now be on a month to month basis, from Oct it increased and end Nov a debit order of R1189 was deducted from my account.. I went to a store to query and they found it very strange as no upgrade was done.. Two call center agents called me today to upgrade, I said I want my query resolved and both of them ended the call when I raised my query.. MTN is quick for sales, but to assist customers with queries, MTN SUCKS BIG TIME.. I WANT MY REFUND!!! as other debit orders bounced because of MTN 's mess up.. I also downloaded the app to see what is going on and already have a bill of R900 pending,which is another mess up.. I would advise ALL mtn users to change your network ASAP!