Account billing, migration and lack of response.

I went to Autopage East Rand Mall for an upgrade in April. ( Blackberry top up to Samsung A3 top up). The new contract was also a top up contract and was suppose to start on the 7th of July which I also signed for. Thus I was told to buy prepaid data in order to use the new phone as the contract was only due to start on the 7th of July. I was told to return to the store on the 1st of June to \cap"my new contract. In the mean time I loaded prepaid data to use my new phone. On the 1st of June 2015 Autopage deducted R1400 out of my account. I went to the store AGAIN on the 2nd of June and was told the contract migration started 2 months earlier and that the R1400 was for my data usage on AN uncapped line without consent?<br> Why would I change from a family top up contract to an open line contract?<br> How can Autopage change the initial date without my knowledge two months earlier and what happened to all my prepaid data that I have uploaded? the store stated that this has not been my mistake and Another complaint was filled in the store AND at home on the Autopage website...NO Response"