MTN stole my airtime

Being a client of MTN is like being in an abusive relationship. Every time I top up, MTN seem to be taking R3 or R6 from my airtime which they can’t explain. Last night I topped with R70 and used R2 for Rush hour data so I can be able to buy the R49 special from their app. I could not buy it because a message pop up saying I have insufficient fund. I check my data, the app said I had R68 and the *141# said I had R48- how is this possible? The called the call centre and the lady says I have R62 something oooooh gosh my airtime seem to be disappearing and I haven’t even used it. I still tried to buy the special and still I couldn’t due to insufficient fund. I checked my balance and now I have R12 something from the app and R1,62 from *141# I called the call centre again. And they could help as system was down. From the first call, I had switched off mobile data from all of my active apps. By the time I went to bed, I was on R0 balance and had not used my airtime for anything. I just want my airtime back and then I’ll find another service provider that does not ***** my airtime.