Tenant not getting notice back to me

[Linda Thomas]

Good morning all,

I need some help with a question please. I sent my tenant the rent increase letter with the two options, accept the rent increase and renew for one year or vacate by such and such date. The letter was due back to me on 12/4 and i didn't get it back. Yesterday i reached out to her and asked her to kindly get it back to me immediately she responded and said she would send it today which was yesterday but never did. How would you now handle this situation?