Initial contact was great while I showed David my ...

Initial contact was great while I showed David my software he was very confident. I Paid my $5000+ Scoping fee (I already have and use software I developed on a different platform which I wanted copied to an open source) then it all went down hill from there.
Long story short don t hand over any money upfront until you are 100% satisfied they can deliver what they promised.

Regards
Adam