Refund

I purchased data on the cellc App on the 30th September and R260 was taken from my bank however I did not receive my data. Since then I have been calling cellc and they escalated the case to their back office team which called after 6 days telling me they will do investigation. After a few days they said they will send me q refund which takes 3 days, I have been waiting for my refund for more then 8 days now. The back office team has now closed the case even though I have not received my refund just because they tried calling me and I did not answer as I was at work. When I spoke to their back office I told them to leave a note stating that when they call they should call me before 9am but they decided to call in the afternoon. I have been chasing them regarding my refund with no luck.