Waiting for Telkom Credit Refund

After months of trying to have an account cancelled, being billed incorrectly & disputes with the debt collectors - Telkom finally cancelled the account. I have now received an account indicating a credit due and an sms stating: 'Dear Telkom customer, Telkom account: ********** 02897. Please be advised that you may be eligible for a refund. You may be required to provide your ID and bank statement. Contact: Ntokozo ********** . Kindly call us to confirm if a credit is due to you.'

I have called this number countless times and it just rings - no one ever answers. I then followed the Pay or Query link at the bottom of the account to the online chat. After being passed to 3 different agents at the Billing department, none of which could assist me - I was told to phone the Billing department, which I did today...and their systems are down (which seems to be a regular occurrence at Telkom).

Please can someone provide me with an email address that I can send the required information to? Or a phone number that gets answered before 30 minutes of waiting?

Kind Regards, Christine