I'm a bit puzzled as Moneybookers did close my account two weeks ago and tells me I can't use their service any longer because I sold bitcoins via bitmarket.eu.
I don't want to blame the victim here, but..
Why do you *openly* deal in BTC? You should always send the money as a 'payment for a service' or 'payment for debt'.
Mentioning bitcoin in the message field is asking for trouble. You should never do this.
And to be honest, unless you did mention it, there is no way for them to know what you sent/received the payment for.