*******ed services!!!!!

I went to cell c in Rustenburg on 3/6/2015 for my cellphone upgrade. I renewed my contract on the conditions that i receive my new cellphone and keep my current contract up until the end of october for when it will expire. the current contract states that i receive my minutes,sms's and 1gig data every month. The morning before i went for the upgrade my data balance showed at 2.7gig data, and when i started to use the new phone i only had 75mb of data. Now cell c's contract says that after 3 months data will expire that is not used. so to my under standing will my data that i received in march 2015 expire in june 2015, but for what reason will they expire 2.7gig of MY data? That is *****ing!!!!! On 6/6/2015 i went to the same store to find out what is going on. they phone the call centre and a lady spoke to me and the only thing that she kept on telling me was that my data expired. I don't understand how can my data for may or my data that i received on the 1/6/2015 expire? so she then finally said that she would log a case (case no:***) and she told me that since it is saterday the team attending these matters will only start on monday, it's wednesday still no response!!