Airtime Disappearing and Bad Customer Service

MTN Prepaid

I have been loosing airtime on my phone, it will just disappear together with my Data. During the week of the 9th August 2017 about R203 airtime disappeared as well as my 500mb data. Again on the 16-21 August 2017, about 1.6gb and airtime started disappearing. I call 173, on the 22 August 2017, spoke to a lady called Thandeka, who blamed my smart phone for the billing errors and airtime disappearing and then dropped the call on me. I call again and asked for a supervisor, the supervisor told me he can't promise any feedback about how they will handled the issue of the call centre agent being Rude to me. As of now, my airtime and data is still missing and the call centre cannot help as they say they are a third party just helping MTN with call centre queries.