TELKOM NOT REFUNDING

I have cancelled my landline and ADSL after so many months of problems with ADSL. Eventually they wanted me to upgrade to DSLite because of a faulty cable which they told me they are not going to fix. I used to be able to log into my account at Telkom webpage, just before the account was closed I saw they owed me over R1000. Since then I have not received any accounts or correspondence regarding my refund. I cannot find any means of getting the refund from them