Nimble group

I hate this nimble group and all its consultant, they have been harresing me for months. I was under MSD consulting paying my debts with them but as soon as I finished. Harrestment from Nimble group telling me I still owe one of my debt, as for how they got my number or get a hold of my info and accounts I dnt know. They keep calling sending message that I should pay my account when I tried explain to the idiot that called me at work today he was so rude full of threats and that Unpleasant tone from him. If only I remembered his name. I rally hate this group.