You could be responsible for any rent until the unit is leased again and you could forfeit your deposit.
I wish you the best of luck!
Russell Benson, REALTOR®
Prudential Alliance Realty http://www.RealEstateOKC.com
Best of Luck,
Keller Williams Realty Elite
Best thing for you to do is consult a lawyer:
If you have no lease agreement, you may have to go to a mediator and/or court. Never hurts to ask, but again, in most cases you will need to make peace and say goodbye to your deposit.
Best of luck!