INCORRECT BILLING

It appears that my problems with MTN are just never ending. Just rcvd my bill dated 11/03/2016 and another stuff up. I cancelled my upgrade I did on the 2nd March the next day after my services were disconnected, and obviously that information wasn't channeled to the correct department as my billing is now incorrect. I CANCELLED MY UPGRADE - SURELY THAT'S NOT TOO HARD TO UNDERSTAND, ESPECIALLY WITH ALL CALLS BEING RECORDED??!! Please take a look at my invoice dated 11/02/2016 and compare it with the one dated 11/03/2016 - it should be the same. Does that sound like a simple enough task for someone to do? And then, once you've had a look at and taken note of your mess, please be so kind and correct the March 2016 one and do the necessary credit. Once again, I hope this isn't a request that's beyond the capabilities of MTN staff. And please tell your call centre NOT to give out numbers that you can't call, such as the sales department that I'm expected to call myself to have your stuff up corrected. Really, you people are just useless! I've always held MTN in such high regard, but boy oh boy, how the mighty have fallen! Can't wait for all my contracts to end!