No customer service

Being a Vodacom contract holder for over 10 years my last contract was a nightmare. Am owing money but I had given notice for cancellation at the end of my term to my surprise I was billed R495 instead of the usual R359 agreement am being hustled by lawyers from Vodacom demanding money I have blocked them as I asked for explaination from Vodacom n I didn't get even a call to say why my debit went up I pay what I can afford as I have taken another contract with a different service provider can't afford to pay more for both providers. Vodacom has no communication with its clients.