Incorrect billing

Hi there,<br> <br> On 1 October 2015 I was due or my upgrade. When I got there they said I could not get it as my debit order didn't go off. I then went back the next day as my debit order payment reflected, I went off and I got my new upgrade.<br> <br> Today (23 October 2015) One of my phones got suspended as they claim it is due to 'non payment' on my account. <br> <br> I have proof on my bank statement that my debit order went off and took it into MTN so that they can unblock my phone. I have been with MTN for many years and never had I had a problem with my debit order and now all of a sudden they say it wasn't paid.<br> <br> The consultant told me that now instead of my normal deduction they will take payment for October and November on the 1st ...... R1700.00 for both months and there is nothing they can do about it even though I presented my proof of payment in store.<br> <br> I am horrified as I do not have this kind of money for an error on/from MTS'S side.<br> <br> How do I fight this?