Have you verified that you actually owe them $15,000. I mean double checked the billing, invoices, etc? I mean $600 -> $7500 seems like a very high increase all

Have you verified that you actually owe them $15,000. I mean double checked the billing, invoices, etc? I mean $600 -> $7500 seems like a very high increase all of the sudden. Get everything in writing. After that, offer to make payments. They will complain at this, but hold firm. Dont be afraid to play hardball. Collection agencies are out for the easy win and expect you to bend over and give in. They will threaten legal action. This is hogwash mostly, a scare tactic. It will take them a very long while to go this route because it costs them way more than they ever admit to.