Mtn consultants are ******

Im very dissapointed with mtn consultants,an mtn consultant by the name of timothy sabelo buthelezi sold me lies over the phone, sold a sim contract of 79rnd a mnth worth of 110rnd airtym and 20gig of which the guy never mentioned its a once off,i only find out today that 20gig is a once off,nd when i tell them i want to cancel they tell me about cancellation fees,why am supose to pay for cancelling when its not my fault...i'll never ever buy something from the phone,mtn is full of ******