How do I deal with really bad/unresponsive customer service?

I sent away a VHS tape to a company that converts them to DVDs, www.videosilo.com I mailed it in 3 months ago and have never heard back. I think they lost the tape. I have emailed them about 10 times, no response...there is no phone number to call them on their website but I managed to track one down and left a message, although there was no number for customer service (they do it all via email). I emailed them and said if I didn't hear from someone soon I would file a complaint with the Better Business Bureau. Still no response! Is there anything I can do or is my tape lost forever?