No help from Vodacom to rectify an unjust migration done on my cell phone account.

Hi everyone, I am highly upset with the service and communication, and experience with Vodacom. 3 weeks ago approx, I spoke to a consultant phoning to migrate my account, so-called to a better package I asked over and over will this affect my monthly bill she said no and carried on, so obviously for a better rate and more data and so on and no extra monthly fee who will say no. got my bill end of April stating R600 more, so I queried this issue with Vodacom, they said they will sort it out and listen to voice recording and so on, it's over 2 weeks now and my bill is sitting on R3500 rand approx, and to get hold of the right person take 3 days. this is unacceptable.