The money you already paid is lost and gone. I generally advise clients to ignore these civil demand letters in the first place. You don't owe them anything. In order for you to owe them something they would have to sue you, (in some jurisdictions prove damages which they most likely couldn't do), and win. Even if they could win, the cost of pursuing this is substantially greater than any amount they can possibly recover so they usually don't. They send out these letters because it doesn't cost much and they are hoping that you don't know better and simply send them the money. Nothing will happen to you if you don't pay it and it will not have any affect on any potential criminal matter. If you are charged with a criminal offense, or if you receive anything from the courts, don't ignore that and contact an attorney ASAP for assistance. Take a look at an article in the Wall Street Journal at the link provided below.
In Washington, the law (RCW 4.24.230) does provide for a civil cause of action by a retailer against a shoplifter on a civil demand even if all the goods taken are returned. If you paid the demand and there was no criminal case that should be all there is. If you only paid a portion of the demand and they still referred the case for charging you may be in a tight spot. Although their demand may have said they would not prosecute if you satisfied their demand, that may not be binding on them. I would advise that you contact the company directly. If you are charged you will be appointed an attorney, do not admit guilt and remember that your payment of of the civil demand does not constitute evidence that you committed a crime. I would advise immediately contacting a Washington attorney in your area.
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