Over Billed and on query it is still not resolved

I've been a loyal DSTV subscriber since 2006. For the past 5 years I've had extra view and paid R780-00 from since I can remember. I went on a weekend away and took my Extra view decoder with me to watch sport. On calling to set it up I stated it would be from the Friday (01-05-2150) to the Sunday (03-05-2015). On return home I put my decoder back as it was and it was working so I assumed all was as it has ALWAYS been. At the end of May I was debited R2200-00!!!!<br> On phoning to find out why I was told its because I have 3 active decoders???? Something I've never had. All I ask is that I get credited for the 2 extra bills and that it goes back to the way its always been. I've phoned 3 times and been promised every time that it will be investigated and feedback given. To date no has ever phoned me back!!