Both of my calling vendors billed me for the same seller
I run two vendors against the same two counties, pre-foreclosure plus high-equity absentee. Vendor A bills $1.10 per contracted contact, vendor B $0.95. I finally pulled both suppression files and compared them against my master pull. 5,800 of 9,200 records are in both. One owner got dialed by both inside four days and told vendor B's caller she'd already said no to someone, and then both vendors submitted her as a lead the same week and both invoiced.
I can eat the duplicate billing once. What I can't figure out is what language actually prevents it going forward. Exclusivity per list doesn't work because I'm the one supplying the list. Dedupe on phone number doesn't work either, skip trace gives me four numbers for one owner and the two vendors are working different ones. Anyone solved this at the contract level rather than by just firing one of them?