one tenant not the lease and one is

[Carrie Jel]

ok I am back again.  My month to month lease runs from the 1st to the 1st of each month.  He moved in a girlfriend in November and approved it via email.  I never got around to having her sign a lease. I KNOW BAD.. BUT I AM LEARNING THE HARD WAY.    He signed a lease 3 years ago.  They gave me notice on jan 22nd that they were going to move out on March 15th.  His lease from 3 years ago says 60 day notice but this lady would probably fall under the month to month statute which is 15 day notice.  can someone please help me figure out timelines.. I have them in  writing agreeing to leaving march 15 then they gave me a 7 day notice that they were going to be out by the end of the month.  Now the texts and emails are coming in saying they will sue me in small claims.  I am going to return their security deposit from 3 years ago.. however.. I am wondering if I have to give them back their rent money because of this lady not signing a lease.  Thanks again.. 

I do not understand this statute and the timeline as it applies to my situation for the unsigned tenant..

When the tenancy is from month to month, by giving not less than 15 days’ notice prior to the end of any monthly period; 

Jan 22nd= we are moving out march 15th

 EMAIL CHANGE OF PLANS Feb 21= notified we are moving FRIDAY the 24th,,, next email no now it is monday feb 27th.... we want our money back... is this considered a 7 day notice?  or does it fall under enough notice.. despite the written agreement on the email.. the lease may not apply to the lady.. so now I may fall under the florida statute.. if so do I have to refund despite the short notice?