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Complaint letter
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Formal complaint / escalationleaf
Rent dispute, billing error, service failure — escalated correctly.
Medical bill disputeleaf
Dispute a medical bill on coding, balance billing, or billing-error grounds.
Security deposit refund demandleaf
A demand letter for the unreturned (or partially withheld) security deposit.
Neighbor noise complaint (formal)leaf
A formal noise complaint that creates a paper trail without inflaming the situation.