STOP CALLING!

I've been receiving calls from this company and every time I pick up the call gets terminated. I called them back asking why I'm getting calls and she took my number to check what I am owing - seeing that they are debt collectors. She then asked me what accounts I owe. YOU are the debt collector, YOU are the one who is calling me, shouldn't YOU know????? If I am overdue on an account then let me know and we will make arrangements but if you can't find anything under my name PLEASE stop calling me!!!