BAD everyting

I have a contract for 16 months now for a monthly data top-up of 2gb. The card is not in my possession because I took out the contract to help an elderly person who can not afford internet access. For that reason there is a limit on the monthly top-up. If the 2gb was used, there was no further internet access. I had no problems until October 2015. All of a sudden it is now an open account and my monthly bill is sky high. I complained several times now and they keep telling me that the account has always been open. When I ask for the proof that I have opened the account to no limit, I get put on hold and after a while they simply cut me off. It happened 3 times already today. I have never, ever, ever experienced such bad customer service. I am going to take away my contract if this is not solved soon and I shall go out of my way to warn people on social media about Altech Autopage.