Disconnecting line usage

It has been 7 days since my last complaint on Hellopetercom and still Vodacom has not sorted out our complaint. We are currently being billed for a service that cannot be used. Since my last complaint I have phoned several times which now I am not able to phone any more as I have used my monthly limit for calling the call centre. Have you ever heard anything of this sorts. Apparently my query was referred to the acquisitions department but as said 7 days and still no one has called. I have sent emails to the Vodacom email address from who I receive an other response each time. This service is one of the most pathetic services ever.