No resolution after 5 days

On Tuesday evening I used yello bucks to purchase a data bundle. I found out on Wednesday morning that it was not working. I called the call centre for assistance and it was ascertained that although I had chosen the correct bundle the mtn system allocated a social bundle instead. I proceeded to use yellow bucks a second time in 24 hours to purchase another bundle and again the bundle did not work.I again called the call centre and reported it. I got a reference number from them. On Thursday I called and was told the issue has not been resolved yet. I asked the lady to escalate the query for me. On Friday I called and was told again the query was not resolved yet. When I called on Saturday afternoon. I was told by Karabo that the issue is still not resolved and when I asked her how long I need to wait I was told up to 72 WORKING hours. Of all the ****! Firstly I have already waited 48 WORKING hours which means nothing as the technical teams do work on weekends as well. So, in actual fact I have been waiting to have this issue resolved for 5 days now and still nothing has been done. And how do I know this will not happen again in future?