Incorrect Billing_***

I called vodacom last year October to do an upgrade for the above mentioned number. And I requested to be put to U choose 200 with no sms no data because i have a separate line for data usage. So the person who was helping me she did the migration incorrectly. I called customer service they could not help me i went to the Vodacom store they also could not help me. They referred me back to the up grades department. <br> <br> My migration was only corrected on the 14th of December however when they were correcting the package they did not correct the billing. I called them again and i was advised that they will pass a credit for the data usage because i was put on an open line incorrectly the data was running in the background for all this time. But that never happened so i went to my bank and advised them to reject any debit order that is more than my normal subscription amount until vodacom resolve this issue.<br> <br> They decided to cut the line because they did not received the money they wanted and I have been calling them since January to resolve this and no one is coming back to me. Now they sending me threatening letters. And I am afraid that this is going to mess up my payment profile.