Unfortunately I wound up having to write off an invoice due to non-payment. It seems that this company has no intention whatsoever to pay its vendors based on my experience as well as on the various testimonials on this site.

I'm sorry to be the bearer of bad news and I truly hope that your exposure with this awful company is not very high but you are probably not likely to collect outside of a lawsuit, which may or may not be worth the cost depending on how much you are owed.