Pathetic customer service for a refund request

I cancelled my subscription for September on the 24th August and DSTV still went ahead and deducted the premium for September. I called them on the 28 August asking for a refund ,it’s been almost a month every time I call they tell I must wait for 7 working days . I have been waiting for the past 25 days . I am not happy at all. they need to sort out the poor customer service .