Suing Tenant for Delinquent Notice??

[Angel Glancy]

My partner and I just purchased a duplex which had tenants on both sides. We gave 60 day notice for one tenant to move out so we can move in. Tenant has been extremely difficult but finally moved out this week. However, I got a delinquent notice for garbage/sewage which according to his lease agreement, he was responsible to pay $397.50. How do we proceed? I know we pay the delinquency, but is the worth court costs to sue?