Cannot use my own dstv app to watch due to rogue devices u didn't register

Every day when I try streaming from my devices I find "strange" devices registered which I kick off daily. I change passwords almost every week and yet there are 2 or devices I keep finding. When these devices are logged on - I cannot stream. So even nowninhavent been able to stream from devices since Friday I am.paying for them to watch every weekend. I love asked dstv what to do - and I get told to change password. Surely these rogue devices are intercepting the signal somewhere and me changing passwords weekly makes no difference as I'm sure they don't even need a password when they intercept