Collection agency asking payment twice!!

[Administrator]

I had to go to court last year for not paying a credit card. before the case was taken to court., I paid off the accnt in full with the collection agency. Now after a year I've received a letter saying they won a judgment against me and want me to pay. I don't have a settlement letter anymore but why should I pay these people twice ?? what option do I have?

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(Source: mortgagefit.com)