MTN mistakes and now I have to pay - ripoff

I went into MTN Canal Walk on 14 June 2015 to cancel a data contract which was expiring the next day. I was told by Lubnaa that she cannot capture cancellation till next day, I must send sms to remind her which I did. Two months later I find out that cancellation not done and I am charged R1024 per gig out of bundle fees, which Clinton assures me is correct. This is the biggest ripoff ever and I cannot believe that MTN can get away with this. I am now sitting with a bill of R4200 for 4 gig and MTN has wiped their hands of this> No call back from Lubnaa as promised, when I go see her i get \ I am still working on it". As many have posted on MTN facebook"