Vodacom has not refunded my R9 377.66 as they promised.

Vodacom still has not refunded me the R9377.66 for a contract cancelled during the 14 day cooling off period, I had raised this issue with them on the 29 April and they assured me that I will receive my refund within 14 days, I have called their customer care regarding my refund, the last call was with a lady named Mariska, on the 14th May at 15:39, she said she will follow up and get back to me. I am still out of R9 377.66.