In 2006 we had a business account with World Exchange. We left them because their billing had constant and unbelievable issues ie: being billed for services we didn't have and overcharging - month after month. At the time we parted ways the account was fully paid except for the overcharges which World Exchange had agreed to refund.
Yesterday I received a call from my secetary that Dun & Bradstreet had left a message with her demanding I call them by 7pm that day and quote a code they left. At some inconvenience I dropped what I was doing and called them.
They claimed they were acting on behalf of World Exchange for an invoice dated 2009 in the amount of about $109. I responded no way did we purchase anything from World Exchange during 2009 (or close to) and we did not owe them a dime. I told the lady at D&B - in no uncertain terms - I still had every invoice from World Exchange filed away and I would have no hessitation in taking them and World Exchange to Small Claims.
She seemed to understand what I was saying but she still claimed I would have to initiate a dispute. I responded I would send them a bill for my time. She promised to send me this alleged 2009 invoice by email (It never arrived).
I then contacted World Exchange and told them exactly where things were at. I was told the outstanding balance claimed was $40-something. After a few minutes on hold the customer service rep came back and said they would write off the claimed outstanding balance - the implication taken is they thought that my business owed the money and they couldn't be bothered chasing it.
To me this looks very dodgy. Not everyone has the confidence to defend themselves and, ironically, this is not the first time I have seen an ISP go feral in association with debt collectors. I think many people would just pay the money to make the problem go away.

