Never, ever relinquish your property to any theater employee. Taking it from you by force is strong arm robbery and possibly battery. *You* should have the police arrest *them*.
That being said, the theater is private property and if they ask you to leave you should without making a scene. The police likewise cannot conficate your property unless they are arresting you, so attempt to reason with them if this case arises.
There must be two things for a contract, consideration (each side gets something) and a meeting of the minds (each side agrees as to the deal). Even if the contract is ultimately valid, this company isn't the government - they cannot issue fines.
They would need to file suit, which includes serving the defendent, and then win a judgement in court. Until then this person would owe nothing. They are just trying to bully. The collection agency is a joke. Tell them not to call under the Federal Fair Credit Reporting Act. If they persist *they* can be sued. If they try to report to credit agencies simply dispute and you will win.
To avoid court there would have to be arbitration agreed to in the contract. They can not just arbitrarily impose fines.
They are hoping to scare people. Don't let them!
And as far as any libel / slander, the truth is always a defense, and you are always entitled to your opinion. Neither are actionable.
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