Poor service

Helicopter On the 29 of March i made a call to the man number 808 to cancel one of my contract and I was told that cancellation was successful. On the month of April I was expecting to get airtime on my other contract number that was not canceled but to my surprise I did not get airtime . I tried calling the 808 number and I was told that my number is not a contract number.I when to one of the mtn store to check why my number is no longer a contract and I was told tha the contract was terminated and I was invoiced with R 5000 for early termination. I asked the person who was assisting me to put me back on contract and also cancel the invoice,but he told that he won't be able to assist me I must call the 808 number.For the past three weeks I have been calling the 808 number and am not getting help.what they do is to transfer me from one department to another and give me reference numbers or they will tell me that they have send a mail to the correct department and someone will call me before the end of the day and they never call.