Purchases didn’t get credited – Fuel Inc - Builder Game Review

I purchased 10k of gems and I got charged, but I didn’t get credit. I did it twice. There is no information on how to contact the developer and I need to get my $20 back!!! I clicked on app support and it says to contact any time, but gives no contact info! The game lags and shuts down every other minute!!! Also, I had 29 gems; they dropped down to 16, and now I have none and I haven’t used any!!!
Review by rodell93 on Fuel Inc - Builder Game.