MTN YOU ARE JUST SO HORRIBLE !

I’ve been on an mtn data contract for two years and was paying R220. The contract came to an end thank goodness cause I wasn’t even using the data as I have fibre. I was asked to call in and cancel it after it expired not sure why cause that should be automatic??I called in to cancel and received confirmation that it has been cancelled. Then all of a sudden I receive messages that I’m being moved to a higher plan for R600. I have been trying the call centre and whenever I call I’m being told that I am on prepaid now and there is no contract in place yet I have been getting messages that R600 will be deducted from my account. Are robots working at MTN nowadays?? Any sane human being would know how INSANE THIS IS!! Why is it so hard to cancel an expired contract?? CANCEL THE CONTRACT