Very poor service in refund an account

My mother is now struggling 7 months already to receive a deposit back from my father`s DSTV account. He died 2 years ago and the estate has been finalized already after they discovered there is a credit amount of R1 489-95 on his account. After so many correspondence between my mother and the finance department of DSTV and empty promises, my mother still did not receive any deposit back and no response on how long the process will take to finalize. Absolutely poor service for a listed company!!!