FTP POKER. HELP ME

[Dogseatrice]

Hi guys. I need help on whether what I did was legal or not. I basically tried to deposit money on fulltiltpoker using mastercard. It didn't go through. I used my visa card and it went through. After I lost some $$ on my fulltilt, my mastercard company called me to inform me that what I was trying to sign online was illegal that's why it didn't went through. But the visa card went through the transaction and I already lost $4 on it. What do I have to do now? Cause I did not went through moneybookers to put money into the account and I did not know that it's illegal to actually put money to fulltiltpoker directly using credit card.