Dstv bad customer service and rip you off

Last month I went on my self service account to see how much it will cost if I add an additional decoder I checked and it was the same price as a normal price, not knowing I added it to my account, right after i checked my balance And it showed 650 , so then I thought the extra price wasn't added, no confirmation, email, sms nothing from Dstv to advise me that the extra decoder was added to my account, today wanted to pay my Dstv account, I went online to check my balance and it was over 2000 shocked because last I checked it was 650 some change I contacted Dstv on the live chat and I was told of the 2 active decoders, I told the girl that it was a mistake and it should be canceled, then I asked for balance and told it was 1400 I asked why cause I overplayed last month, so my balance was 650 some change she said its cause I had 2 services active, I told her it was a,mistake please cancel it from inception because the decoder wansnt even plugged in I only have one TV so why am I liable for two services when I used one, I told her to check there system that one I didn't even use, only to tell me I'm still liable because it was active on there side, why in the hell should I pay 800 for something I didn't even use, Dstv has no respect for there customers subscription is already so high, but they try and take everything center where possible, I just have a 800 lying around to pay for a subscription i didn't use, what's that, I asked to speak to a manager and was told I will gt a call but nothing, no wonder they are losing customers you guys are *******s, I've never come across this, I will also report you to consume protection dstv