MTN Robbing people of Airtime even though Data has been loaded

Good Morning, my name is David and MTN is *****ing my airtime. I have loaded data of 1 Gigabyte that will only expire on the 13th of December 2018 and I had airtime to the value of R106.39 this morning according to the MTN app. MTN used my airtime and not my data when I went onto DSTV now app. They have basically ****** me of R106.39 airtime and have not touched the data I loaded. This is a huge issue and MTN should have been giving the matter attention immediately. I was told by Puledi that I would be called back in an hour and not re-assured that if I load airtime it will not be used up instead of my data. MTN is pathethic when it comes to dealing with issues and customer service. They could not help me. I will be forced to switch my service provider.