Cancelled contract but still billed

I am really unhappy and disappointed at Vodacom .I feel like they are a **** to me and only interested in cashing sales.I have been given a wrong contract ,then had to pay premature contract cancellation fee.I painf that cancellation fee,have been emailing them to ask for cancellation letter ,no response .Today I receive invoices contract is not cancelled .Now I write to Hello Peter ,they are too quick to answer here but very slow to offer service to customers.Such a poor service ,won’t recommend to anyone