Took 480 dollars from me

I had used a free spin bonus earlier in the day. Played what I won from the free spins until it wasn't possible to spin as the balance went well below minimum bets. I beleive it was .04 cents. I could figure it out but they won't send me my play history. I then deposited 6 hrs later, won 480.00 dollars, went to withdraw. It said I had an active bonus which should have cancelled automatically with such a low balance. So I did what I have done on many, many, many other sites when the active bonus from previous deposits didn't automatically finish. I canceled it as none of these bets were obviously with bonus funds as I didn't have any bonus funds besides .04c. They then said when I contacted them that I won the 480.00 dollars with bonus money, which was not possible. Please help me get this sorted out. They won't even reply to me anymore.