MTN robs me of data and airtime and cannot assist

It has been an ongoing problem where airtime and data that I've purchased from MTN has depleted almost immediately without me being able to use it. Today I reached my breaking point and decided to query this problem. I sat on the phone for 2 hours being transferred to different departments, being hung up on, and being bad mouthed by 1 assistant who even told me I'm being impatient. I have the call logs to prove the amount of my time MTN wasted today. During 1 call a lady kept me on hold for 20 minutes and then tells me I need to phone them back a week later. When I asked for a complaint line, a manager gives me a number which took me back to the same call centre. MTN has taken a lot of my money and wasted a lot of my time today. I would like Mtn to pull all calls from my number to their service departments today and listen to the poor quality of service, attitude towards me as a customer, and sheer lack of support I was able to receive. Today MTN has lost me as a customer, I would like to be compensated for all loss of money I've suffered and I would like my contract to be ended immediately without having to pay further costs. I cannot believe the disrespect MTN has shown me today!