Dstv reconnect without my permission

WHY DO YOU KEEP SENDING ME SMS THAT I HAVE PAID AND YOU HAVE RECONNECTED MY SERVICES. I CALLED TWICE LAST YEAR TO TELL U THAT I DON'T HAVE A DECODER ANYMORE AND DONOT WANT YOUR SERVICES. I JUST CALLED AND WAS TOLD IT MEANS SOMEONE ELSE IS USING MY SERVICES. CANCEL MY ACCOUNT I DID NOT PAY. THIS IS THE 3RD TIME I CALLED. CANCEL CANCEL MY ACCOUNT!!!!