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Good afternoon. What you want to do is raise the stakes on them so that they know that not resolving this immediately is going to cost them far more in the end. Find out the email and mailing address for their general counsel and one of the officers of the company. Then, send an email (because it gets there quickly) and a certified, return receipt requested letter detailing the history and demanding that they get their lien released within a short specified period of time. Inform them that if your demand is not timely complied with, you will have no choice but to file a suit against them for your damages
. Be sure to specifically mention that you will be filing this claim not only as a breach of contract case, but also as gross negligence and bad faith causes of action, which will entitle you not only to your actual damages (including any and all damages you incur due to their lack of performance), but also an additional amount equal to multiple times your actual damages as punitive damages. Once the recipients of your correspondence get wind of what's happening and their potential liability, that should provide plenty of incentive to comply with your demands; but, if it does not, file your suit.
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