Whoa--stop this train! 3X the estimate? 10%/month? They are grifters and they think they can scare you. Call their bluff on "theft of services" and tell them you've decided to call the police and report them for fraud.
Then will then rant and rave. After they are done ranting, tell them you will pay $165 if they send a new bill that indicates that $165 would be payment in full.
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