Telkom owes me money for over 5 months

I cancelled my account with Telkom in March 2015. After canceling my account, I was issued with a invoice indicatin that I had a credit balance of approx R960. My landline number was ***. After numerous telephone calls and emails to Telkom I still haven't been refunded this money. Telkom was very quick to charge me 12+% pa interest on outstanding monthly bills, I wonder whether the reverse will apply as I have been waiting for the refund for more than 5 months now. Please can someone at Telkom sort my refund out. I have immigrated to australia so the best way to get hold of me is by email.