Unfairly Charged for Free Wifi

I went overseas in October 2014. I came back to SA with a phone bill of R16000.00. After close inspection of my itemised bill I was charged for being connected to FREE WIFI. This I find a little rediculous as it is a FREE service. My husband who is on Vodacom was on the same trip and he was not charged for using FREE WIFI. I am now sitting in a situation where Autopage is saying that you get billed for using international FREE WIFI then it isn't FREE. I am now in a position where I have to pay R20000.00 for my phone to be unbarred where payments to the value of R4300.00 have been paid and no allocation has been made and the owing amounts keeps increasing and not decreasing after payments have been made. I feel that I have been wrongly charged and no one at Autopage knows anything and just keep saying that the outstanding amount is R20000.00 and it needs to be paid. I am not happy at all with this and in fact for the 14 years I have been with Autopage dealing with bad service this has to be the worst.