Does Online Sales Depot onlinesalesdepot.com have a phone number where you can reach a person?

I would like to purchase a camper from Craigslist. However, the seller wants me to go through a company called Online Sales Depot ; a company I have never heard of, and I have been buying and selling on eBay and Craigslist for years. When you go to their website, www.onlinesalesdepot.com , under contact us, it does not provide a phone number where a person can be reached, there is just a note saying they are too busy to answer any phone calls.Has anyone ever talked with someone from Online Sales Depot, and how would I be able to do the same.Are they legit?