Expired contract - TALK TO ME!

I have been trying since February to get MTN to engage with me in terms of an iPad contract which has expired. They are now billing me month-to-month when I expressly asked them to cancel the contract (Which in itself is just bizarre as the contract had a fixed period, which has come to an end). <br> <br> Why is the onus on the customer to run after you? Emails go unanswered. Call centres keep me on hold far too long. <br> <br> WHAT ARE MY OPTIONS now that this contract has ended? Please contact me!