Nantucket Wild Gourmet & Smokehouse has not paid an invoice for products sent over 4 months ago and lied about sending a check Internet

Nantucket Wild Gourmet & Smokehouse has not paid an invoice on gourmet food products my company sent to them over 4 months ago.  I spoke to them a couple of times and they told me they were going to take care of it.  Then they lied to me that they had sent a check which I never received.  After that, they never picked up the phone when I called and never returned my messages.  I was willing to take a credit card or even set up a payment plan if they could not pay in full, but they just ignored me.  I sent them a final demand letter last week when the invoice was over 90 days overdue and they did not respond, so I have turned them over to a collection agency.  Do not ship any products to this company and do not extend any credit to this company because they will not pay you!