Exceptionally continued poor service from Vodacom

This is not the first time I am posting on Hello Peter about Vodacom. Our company is still battling to get someone for Vodacom to get back to us wrt our Business Gateway account. They seem to not want to sort out the issue, but have threatened us with hand over procedures etc. We do however get the monthly bills religiously.... We are still at a loss wrt this as we have not been using this service for almost a year now. They are ignoring our cancellation completely and persist in sending out invoices every month.