Telkom debits

Telkom mobile has debiting my account for a contract I dont have. I have notified Telkom mobile that I did not request for a new contract from them. They advised that they would stop the debits on my account, they said i must send an email to *** buy i get a message saying The recipient's mailbox is full and can't accept messages now. Telkom is debiting my account with amounts I know nothing about.