topbet.eu topbet.eu fraud/scam Internet

I deposited mutliple times on topbet.eu and recently requested a withdrawl of $600.  According to their website it said the payout would take 5-7 business days.  13 business days later I finally received my check, which was hand written, when I took to the bank it was drawn on, the bank told me that the check was invalid and unable to cash.  I contacted topbet to inform them and the only solution they could offer me was "they would escalate it to their security department and it would take 48 hours to get back to me, they said after that it would be another 3-5 business days until they could re-issue my withdrawl".   I believe this is a scam and a way for them to retain their money.  They are shady and everyone should stay away from this place!