Not solving problems

In April 2014 I bought an ipad, went to Autopage in Port Elizabeth, got a sim card for my ipad and linked it to my cell phone account, with instructions to only charge for a gig when needed as I used wifi most of the time, so no contract whatsoever. I left Port Elizabeth in 30 May 2014 to temporarily stay in Johannsesburg until we left SA in September 2014 which is when I moved back to the UK. I went to Autopage in Nicholway in July to find out what the procedure as my cellphone contract was due to expire at the end of August and I wanted to cancel this. Everything was done as instructed, however I am being billed monthly for a gig for my ipad and have been told that I apparently took out a contract for this on 18 July 2014? Despite many emails, to which I do not get any response, just as many phone call, which are costing me a fortune from the UK, I am not getting anywhere and am still continuously billed on a monthly basis. I have requested a copy of the supposed contract on numerous occasions, but nothing is done. I am billed an extra R95 by my bank each month for this debit order, as I do not keep funds in my SA account. Am totally fedup with Autopage.