Not all information given and I am paying for their investigation

I was phoned and led to believe that DSTV is part of the monthly subscription, not once did the agent correct me and tell me that I still would need a DSTV subscription that the Device is not DSTV included, I have 2 Smart Tv's at home I had no need for the device - I cancelled within the 7 days on the 11th of Aug, but a deduction was taken off my account the 25th of Aug under the reasoning that they need 7 to 14 days to investigate that what I am saying is true - so not only did they not give me all the correct information but I am paying for them to take their time to investigate - I am extremely upset with them.