Billed for 3 months after cancelling contract

From the same query that i had before Ref number *** i cancelled my contract on the 21st of April 2015 of which it was supposed to be cancelled within 2-7 days and it was not done. I tried to get hold of Mtn but all in vain due to their strike. May i was billed a R1000 <br> June R800 <br> July R400 <br> Contract was only cancelled on the 1st July after complaining through hello peter, no call was recieved to show customer care i just saw my phone not working. What kind of a service provifer is this. This is not acceptable in any way<br> Please may i be refunded my money i need it Mtn breached the contract and it was not my fault for them not to cancel the contract. Why should i suffer for one employee's incompetence. <br> I was thrown out budget and i need my money a customer should not suffer because a company did not fulfil its obligations. I cancelled the contract knowingly i cant afford to pay it anymore<br> Thanking you in advance