MTN CONTRACT ENDED 20 MARCH 2017 BUT STILL BEING BILLED

<p>Good Day,</p> <p> </p> <p>My MTN Contract ended on the 20th of March 2017, I have called well in advance to cancel the contract and i was told my last payment will be at the end of April 2017 but now im being told my last payment will be end of May 2017, did i take a 24 month contract or 26 month contract? this does not make any sense to me! Can someone assist URGENTLY!!!!</p>