Wrong charges. Wrong refunds.

Have a holiday home account with DSTV. When connect Friday afternoon and Disconnect Sunday afternoon via their Self Service website / call centre the charge for the -+48 hours usage according to them should be 3 days. But then they charge a full month until end of your billing period and does not so the reversal. I email them every time to ask for tge reversal to be done and then it takes days to do... and sometimes they even reverse the wrong amount which again forces me to ask for another correction which again takes days. Pathetic sustem and service.