putting my dstv off

I phoned dstv 2015 to reconect my service,I had it stopped for a while. I was moving around,use to have a debit order with dstv which was working good. Since I had it put back on,I've been making payment at Pick&pay.Telling dstv I don't want debit order at this moment.Then Dstv went and paid money into my bank account,they phoned me to say sorry about that.Money then was reversed.It was just over R300,then their was something like R30 short in my account,I then said to dstv I will pay that money at pick&pay when I pay my monthley R200,which is the packidge I've got,the said that's now problem. And since then dstv is totaly mixed up ! They switch my decoder off twice a week,then I have to get enough airtime on my pay as you go cell to phone,and hold on for an half an hour,then they will say to me I need to pay so much first,and the next one I speak to,then say I must pay so much,which is not even the same amount. Then I tell them I don't owe them money. I have all my slips from pick&pay. Ugh ! This is now gone too far,I want to do a debit order with them again,but I cannot take a chance if they are so mixed uo