As far as customer service goes, they are all bad.
MTN has historically been pretty good with broadband and coverage, especially when it comes to speed, but their service has degraded severely over the last few years. I'd say Vodacom wins on signal, for the most part.
Your specific location...
So... I found someone at Vodacom willing to help me sort everything out. The root of the problem comes down to mistakes made at the company (understandable) and the fact that most staff have severe tunnel vision and can only focus on one thing. For the most part, nobody "owns" a problem but...
Apparently, my score is classified as "Great", although it does show an arrears account, which not surprisingly, says Vodacom on it. Vodacom staff have also referred me to Experian, who tell me to go back to Vodacom because they reported an arrears account.
Unfortunately, no other provider has the coverage I need, and I travel to places where Vodacom has a monopoly on roaming agreements. I need their technical capabilities, not their customer service, but to be frank, the other providers are just as bad.
How does one dispute a contract application decline with Vodacom? My application was declined for bogus reasons (allegedly, my account was in arrears - this false flag was removed from my account). I have spoken to several departments at Vodacom, went to the store, spoke to the manager, and on...