Nimble who handed me over to you?

Out of the blue on my clear score I saw this company's name I don't even know why they're under my accounts. I never took anything from them. So, I did research all to found out all along this is a Debt management firm. I don't pay people or companies I didn't work with in the biggining I don't owe them a jack. They must call or email me straight stating what creditor handed me over to them.