Not satisfied with service and incompetency from Vodacom people/ consultants

I have been having problems with fibre account which Vodacom decided to increase without ny knowledge, I sent an email saying same but no assistance was received. Upon checking again I’m told I have another device I should be paying for and in arrears but I have no knowledge of it, if I’m checking with customer care to tell which device they keep sending me to go to the shop when I get to the shop I’m told to call customer.