credits gone, no support, crashing app

loved the idea so much I bought $20 worth of credits. sent my first postcard (cost = 1 credit, balance = 19 credits remaining) and logged in the next day to find my credit balance was 0. sent a support request from the website and not a word back from them -- what do I do now? theyve got my $20, arent following through with service and arent responding. its fraud.

euphuist about ByPost Postcard Maker, v1.7