I had a problem with this seller, @sugarfreedaddy, quite some time ago.
This was reported here.
The situation was: I purchased a module, he did not send it. He was "unable" to send it, he was also "unable" to refund me.

I think that the situation was quite similar to what is being experienced here (with several purchasing the same module)

I talked to him via messenger. I had to insist a lot, during weeks, months. He was never "able" to refund me, but after weeks he ended sending me other modules for similar value.

I don't know if you guys will find a way to get your money back. I'm just writing this here to encourage you all not to give up.

Good luck to you all!