Newbie breavan
It is quite easy to explain what has happened, you went to a scam site then had a failure of common sense, gave the scammers your money and payment details, now they are wringing all the money they can out of your account.
That's what happened.
Now contact your CC company and tell them you want your money back because you were conned by a scam site set up to part the naive from their money, and being a newbie you really didn't know any better.
Delete all the rubbish they let you have and download LW or LW Pro from here:
http://www.limewire.com/english/content/download.shtml
Just remember in future, when you want to purchase something via the internet do some research about the company you want to do business with. But if you can't do that then give your money to charity.
UK Bob