[JeremyD]

1. Len - start asking them for their contact information, business license number, state of incorporation.

2. That usually stops them calling. If it doesn't, explain to them that you are trying to run a business and they are interferring with process.

3. From there a letter outlining that their debt is with an individual, incurred on their personal time not your business or during business hours and to cease and desist.

4. From there contact their registered agent with a return receipt.

90% of the time - #1 works. I've only had to get to #4 once.

And for you folks out there that are not on an hourly wage - try going though a divorce - get injured, have a child get sick where you have to care from them, have a spouse get laid off - identity theft, etc - and not have a collection agency after you - it's much more common than you think.