My Tenants Said I Should Give Them 3 Months Free House Rents.

Hi everyone i sold my 2 plots of lands last year to build a house . so the issue now is that my 4 tenants rent have expired since last month. my junior brother informed them there house rent have expired the told him that i will have to give them 3 free months. that is what Nigeria law said unless i should them Quit Notice .It's very sad that a house i build with my hard earn money somebody will be telling me that he will live in my house for free. I want to know which step i have to take