Extremely Disappointed

I have always had a good experience with Vodacom up until now. My contract expired at the end of March 2017 and I upgraded to a new contract. Unfortunately, I have had endless problems with no end in sight. I am being billed for the old device as well as the new device. I have contacted Vodacom on numerous occasions and I have been told that it is with solutions, they have made an error, it will be rectified, and so on and so forth. I have always been a proud Vodacom supporter, but after 6 months of broken promises I am left disappointed and utterly disgusted at the poor level of service.