Unhappy unhelped customer

I bought data on *135# using my prepaid number. The data I bought 3+3 GB for R79. It did not specify if any of the data will be night surfer. After I bought the data, I only see 3 GB then I wonder where the other 3GB went. I checked on all Data balance, that's when it showed that the other 3GB was a night surfer. I phoned 135 to try to get my airtime back and for MTN to take their data back so that I can buy data that is better suited for me but I was given a reference number and told to wait 5 working days. I waited 8 working days then I phoned again, I was given a ticket number saying the person who assisted me did not refer the matter, I was told to wait 24 hrs then call gain, I have been calling for more than 5 days and the matter still hasn't reached the data department and my airtime is still not reversed. I am stuck with data I cannot use and no help from MTN. They advised 10GB for R99 but you cannot see the option to buy that, then I saw the 3 +3 then thought it's 6GB only to find out its 3GB .