MultiChoice Africa / DSTV review: price lock

I'm on dstv price lock for R499 P.M and this month I was debited R1984 without any explanation and I've never skipped a payment, a day later the money was returned. I phoned them five times already and whenever I call i get told that they matter has been escalated and they will contact me without 24 hours, it's been been seven days and nobody from dstv has contacted me. Today I got an SMS saying my service has been disconnected.