Overcharged & credit due

I wrote a report a week ago and no-one has contacted me to resolve my issues. I have been charged for a period that hasn't even finished yet. The dates I'm being charged for on the my invoice are 17 November 2015 to 16 December 2015. It is only the 8th of December 2015 today so somewhere Altech Autopage is guessing as to data & telephone usage. I want an explanation for this please. There is absolutely no way that I go through so much data & I have repeatedly asked Autopage to check on this. For the last few months, I have phoned in to check on the data & have been told I am not in out of bundle yet but according to my bills, I am being charged hefty fees for out of data. I get sms's saying I am out of bundle & then a day later get an sms saying I have less than 1.2GB left. It makes no sense. I suggest that Autopage checks their call recordings and passes credit on this account. They have now suspended my line which is unacceptable.