Preventing two cold calling vendors from double billing the same seller
A common problem when running two calling vendors against the same territory, say pre-foreclosure plus high-equity absentee across two counties, is duplicate billing on the same owner. If vendor A bills per contracted contact and vendor B bills at a slightly different rate, and both are working the same master list, a meaningful share of records, sometimes well over half, can end up in both vendors' pulls. An owner contacted by both within days of each other, who tells the second caller she'd already said no, can still get submitted and invoiced as a lead by both vendors the same week. Exclusivity per list doesn't solve this when the operator is the one supplying the list to both vendors. Dedupe on phone number doesn't solve it either, since skip tracing often returns multiple numbers per owner and different vendors end up working different numbers for the same person. The fix that tends to hold up is contractual rather than technical: split the source list geographically or by list type between vendors rather than running both against the same full list, require each vendor to report contact attempts back within a short window so overlap gets caught before both bill, and write a contract clause that the invoicing vendor is whichever one first logs a qualifying contact with the owner, with the second vendor's invoice on that record void. That shifts the incentive to reporting quickly rather than to volume, and it removes the need to dedupe perfectly on the front end.
