Tenant gave 30 days, refusing to pay last month rent, saying use security deposit

[George Red]

Any tips or tricks for getting last months rent from tenants when they've given 30 day notice and are refusing to pay last month of rent. Tenant is saying that the security deposit should be used for last months rent (although explicitly not allowed per the lease). If they are in deed moving out in roughly two weeks... is it worth the effort of filing for eviction etc.. or how do you approach these types of situations? Not classy on the tenants part and they've otherwise been pretty good tenants.

Trying to protect my downside in case they don't actually move out at the end of October (although I did get a landlord reference email weeks ago so I believe it's legit they're moving out), also not wanting an upset tenant to trash the unit on their way out being spiteful... trying to walk the line here. Any advice/tips or tricks you've used in similar situations? 

Thanks in advance.

[Matthew Paul]

When that happens , I post a pay or quit notice on the door that rent is due , how much the late charge is and on the 5 th day if not paid I will file for eviction for non payment of rent .And that the security deposit is not a rent payment , but its for any damages and will be returned within 30 days if the house is in good shape .  Then I would verbally tell them after that that I will call the new landlord and tell them that you didnt pay rent . 

Tenants dont dictate terms to landlord