Refund

Telkom has been debiting my account incorrectly for a number of Months. I called them and advised they'd refund the funds debited erroneously. They then promised to contact me to confirm the bank account details to which the refund must be credited. I waited for their call then decided to call them back. Upon calling them, was told that they tried calling me but couldn't reach me - I have no missed calls nor voice messages. Furthermore, they told me my case would be closed after three failed calling attempts. But how can the case be closed when I haven't received a single call from them!? Please refund me!