Non responsive seller ?

Good Day All,

I have a seller with what is almost a "too good to be true"item.
Yet it is just the opposite as the usual .

This one has not replied to a single email, note, etc. 
and i have send several over a three week period.

The item ends tomorrow, and support states that thee is no policy for a seller to reply.
I suspect that the item will just go *poof* when it ends, but it is very frustrating to say the least.

anyone ever dealt with other sellers like this ?