I live in santa rosa county florida , and my land lord does not repair major things in our house and on the pr?

We have asked several times for our land lord to fix the a/c and the septic . they say if they do they will have to raise our rent drastically .where can i file a grievance against them . because from my research it is florida law they maintain these issues . and have read that it is unlawfully to raise rent do to repairs that are there responsibility.