Debt collection is a paper note in Fallout 76, introduced in the Skyline Valley update.
Location[]
Can be found at the Slumber Mill Motel, in room six on the second floor (the crime scene), on a bed post.
Transcript[]
Martin Hackford -
Have the money, plus the interest you borrowed from us by tonight. Final warning. Your wife and kids are counting on you to do the right thing.
Don't disappoint us.
We know where you are...
Regards
W.