Tenant hired maid service, didn't pay, now they want to sue me

[Sam Marks]

Hello BiggerPockets! Super small time North Carolina landlord here. I received a letter from a cleaning service, envelope is addressed to me. The notice I took out of the envelope is addressed to my tenant with the address of my property. She cancelled a cleaning service the night before (3 months ago), they charged her a $40 fee, and after her not paying it for three months it's being addressed to me, the landlord. I called the cleaning company and they said all services to the house go to the property owner of the house and that they were going to take me to court for a service my tenant initiated and I knew nothing about. How is this legal? 

[Tim Bellnier]

Terrible advice Cheryl