Fortune Island Slots

I just started playing this game and I really like it (great graphics), but a pop-up offered 6,250,000 in credits for $2.99 for new players, but it will not allow me to get it. It keeps showing other amounts to purchase. Please help.
And now, after not playing for a few hours, I am back to Level 1, with only 1000 credits. I tried App Support but keeps saying "cannot find page".

Hookem High about Big Hot Slots Social Casino - Free Spins, Pokies, Jackpots, & Las Vegas Games