Worst service ever!!!

In March 2015 multichoice approved me for an explora on the R799 fee per month fixed for 24 months. After a lot of fighting, calling and following up I eventually received the Explora in June 2015, however when I called to activate the services they told me my payment will be R849 per month, so I queried this as well as I was approved for R799 and agreed on that before they sent the explora. Till this day I have not received feedback. I called on the 29th of July to find out if the installment has been fixed only to get told my account is in a credit and I will only pay R149 this month, well the money went off and they took R895??? Why? When I called again I get told they will escalate the problem! Really this is ridiculous! I want my money back and I want to know where my credit went??? The service is terrible and no one seems to know what to say! They should leave notes on your account so when you call everyone is on th3 same page and you dont have to tell the whole story again! I need answers, PLEASE!!!