Mtn Robbing our money again

We have been with MTN since they started in the country and never had issues, a few months back when loading airtime, it would "dissappear" within minutes, load airtime again, dissappear again. costing us a load which we cannot afford. Our family uses whatsapp most of the time in order to communicate, but is causing major issues with regards to safety and regular communications. This week the issue started all over again, few months back we thought it would blow over when Vodacom communicated to their customers about similar issues, not a peep from MTN though? So we held on, and now again, today of all days, zero balances? My wife loaded R60 this morning, I helped to load 300mb data from this, R60 less R35 =R25, MTN calculation R60 less R35 = R15?

We as a family can no longer afford to accommodate your system "upgrades" and such. When we phone 173 we do not get assistance apart from being told to turn off everything data related on the phone, Whats the point of having a phone then?

I've attempted to turn off all add's taking up airtime as well, but to no avail. Is this some type of torture in order to force people to take up contracts in order to have "less adds". This is the impression we get from talking to Mtn shop assitants?

Has it become time to move over to Vodacom?