Refusal to extend my contract as was offered to me

The worst customer servive that I hae ever encountered. My contract came to an end and I was called by an agent to extend the contract at the same price ( actually R 1 less per month ) for the next 24 months. I agreed to this. I had all my documentation ready when the courier came to deliver. However the courier's device could not read my fingerprints and he refused to deliver despite me having my ID document and prooo of address, banking details etc to show him. The next thing I hear is from an sms from MTN stating that my contract has not been extended and that it is now R 50 more per month on a month to month basis. I called MTN and after being put through to 6 different people, every time being put through to another person and every time being told it is the wrong department. Finallly I was just cut off after being told that I will have to stay on a month to month basis as the time had lapsed for extension of my contract. I WILL BE MOVING TO ANOTHER SERVICE PROVIDER AS THIS IS JUST ABSOLUTE POOR CUSTOMER SERVICE!!!!