They do owe you for rental reimbursement, but probably only for as long as it took to actually repair the car.
Unfortunately, I doubt a lawyer would help because the amount of money involved is probably pretty small.
I would send them your receipt and keep after them. They should pay this.
Based on your question it sounds like you did not have a rental vehicle while your car was being fixed. Therefore you are entitled to be reimbursed for "loss of use" of your vehicle. Additionally, depending on the year and make of your vehicle, you may also be entitled to diminished value. This is something an attorney would pursue on a contingency fee basis. If you would like additional information, please feel free to contact me.
They are wrong and should have allowed you to use one of theirs. Under FL law they owe you for repairing your vehicle and they owe you for loss of use of your vehicle if it was disabled due to the property damage. As a practical matter however it may be difficult to hire a lawyer if the amount of your loss is small. If they have fixed the car you would also need to make sure you have not released them from paying these damages if you signed a release already.
A roundup of the best tips and legal advice.