Refund Request.Im so frustrated&disgusted with MTN

Following my previous complaint,my account was credited with R349.I then requested an early termination and was told via email they even sent me the calculations and they told me to pay R904.I paid them the R904.I called them the on the 24/02/2016 to tell them that i had made payment and they asked me why i made the full payment as i had a credit of R349,of which i advised them that i just wanted to cancel the contract and the rest i will deal with later.I called them on the 04/03/2016 to request a refund.The request was done for the R349 and i was told it takes 5-7wdays.I called last week 2times and everytime the agent would put me on hold for 10-15minutes and when they came back the call was dropped or the line went dead. I called again yesterday on 14/03/2016 and spoke to Mahlubi and he did the same thing.He put on call for 12mins and when he came back the line went dead.Throughout this whole process,NOBODY and i mean NOBODY has ever called me back. Today i called again and i was told there is no refund due to me. So wat happened to the R349? My number is now prepaid, so when i call them i have to enter a contract no, so i hav to call 4 or 5times jst to get through.