Incorrect billing

I cancelled my contract with Autopage, effective date 13 May 2015. I then went on to prepaid. I discovered that Afrihost cannot provide data on prepaid which forced me to revert to a two yoer contract, which was activated on 10 June 2015. For the inbetween period that I was on prepaid I received a bill from Autopage for R244. Despite many requests to Autopage to explain the reason for this bill I still have no idea what it was for.<br> Please help