Vodacom overcharging and bad service

Utterly dissapointed in Vodacom who started charging me absurd amounts. I received a call from their migrations department to offered to change my contracts so that I can pay LESS for more data and avoid out of bundle rates. The next month they started billing me for rediculous amounts that I never agreed to.

But this is not where it ends, I've been on the phone to them for weeks now to get the issue resolved. Various customer care consultants raised and escalated the issue and it remains unresolved.

I had a similar experience when the upgraded my personal contract incorrectly to the wrong package which to this date is unresolved.

I also never have any cellphone reception in our area despite being in a prominent city, which I have also raised countless times with them. No resolution to that either.

Why are tied into fixed term contracts with this level of service?!