MTN removes data for no reason

I uploaded my MTN data with 2GB on 25 July 2015. This added to the 1.3GB already on the account, thus making the balance 3.3GB. As of 23 July the balance was 3.05GB. My cell phone tracks data and all that was used was 212MB for the entire month of August. As of 25 August my 3GB remaining data went to Zero. <br> <br> I called the call centre and spoke to Tapelo at 10:18am. She informed me that MTN data only lasts 30 days. This is blatant theft as I purchased the data online at the FNB banking portal. I purchased 2GB of data, and there was nothing said about it only lasting 30 days. I paid for data not for 30 days with of data. I want my 3GB of data that was honestly paid for back!!!! MTN is letting customer service fall through the floor. I have been a loyal customer for close on 20 years now, and I have decided now that I will never support them again.