Telkom refund due

I cancelled my landline in 2017 due to poor quality of my land line and ADSL line. My last statement received on 4th February 2018 reflects a credit balance due to me of R 270 -97. I have tried everything to get a refund. The Telkom stores say they don't have cash for refunds and that I must contact billings department. You can not get through to billings no matter when you phone instead you get repeating recorded messages. My account number is ********** 80001 and old land line number was ********** 322.