Vodacom - Bad Customer Care

I had called Vodacom in May to cancel 2 of my contracts, they only cancelled 1 in August and the for the other one, I received an invoice stating that i need to pay R589.93. So they don't cancel the contract, stop giving airtime and data and then still expect me to damn pay. When I asked for a recording of the conversation, the consultant said she cannot as there is not recording yet at the beginning of every call they clearly state that these calls are recorded. When she couldn't do anything further, she cut me off. Can i please get some assistance urgently as i am now liable to pay the almost R600.