Refund of funds

I stayed in one of their units for 2 years, i left the unit in good order/good condition. Contract i signed with them says refund of deposit will be paid within 21 days. I am approaching 45 days or more, still no refund. They debited my account for rental after i had left,I cant get hold of the people at the office, i have left countless messages no response. My heart hurts over this. May i please be refunded the monies due to me please.