Party Make a Withdrawl From my Account for Themselves

[Gaussen]

I had $57 in my Party account this was taken by Party without warning or email. I became worried about security. I sent party an email concerning the concerning transaction. I got this reply.

Dear Andrew,

Thank you for contacting us. Please note, due to a technical error the
funds were sent out twice for the following cashout:

Date : 07/04/07
Amount : 500.00 USD
Cashout Option : BPay

Hence you should have received the funds twice in your BPay account. We
have already collected $57.00 from your PartyAccount in this regard.
This is not a normal cashout and the funds have been collected by us.

We request you not to get upset about this. The website is secure and
your funds are safe. We request you check with your bank and then make a
payment to us for the extra amount credited to you. We would appreciate
your patience and understanding in this regard.

If you have any questions please contact us, we are available 24 hours a
day, 7 days a week to assist you.

I am a law abiding citizen and if it is that case I have been credited twice I will repay the money. However, what has really upet me is that party made 'Zero' attempt to inform me of the circumstances until I contacted them.
Input Please