Deducting too much and products still not working

I have already written a report due to the fact that my Explora decode does not work. It was delivered on 29/01/16 and I am currently on the second decoder and I still cannot watch live TV only Catchup.<br> <br> On the 1st of February R1168,50 was deducted from my account and on the 29th of February 2016 R1674,00 was deducted from my account.<br> <br> I do not understand this as the agreement was R899,00 a month. I don't know what the next step is. It's been a month that I cannot use the services but instead of charging me less they charge me more for the privilege of a defective decoder and not being able to use the services I pay for.