Not received data data or smses

During February 2015 i upgraded my contract ***) at MTN telephonic at ***. The telephone was delivered at home. I upgraded to a Sony Xperia M2 Aqua top up 50 for the amount of R229 p/m. On 20 February MTN deducted R239 and i did not receive data or smses but only Calling Minutes. On March R362,98 was deducted and still i did not receive my smses an data but only calling minutes. I have reported this in the mtn store potchefstroom with a reference no and also requested a 1GB extra for R149 .On 20 April R525.72 was deducted and i only received the 1GB and calling minutes but still not my smses and data. On 20 May R398.00 was deducted and i received my data and smses and calling minutes according to my contract. On several occasions i went into the store to enquire about the data and smses that i did not receive from February until May. The sails person informed me that I will not receive that smses or data for the mentioned monthes because the months have passed already. Due to the fact that my mother is paying this contract they insisted that she should handle the query. She sent emails and reversed the last two payments at the bank. What should i do next?