Does not refund deposit made

Hi rented a car with Avis on the 12 August 2015 and returned the car on 13 August 2015.<br> My agreement number is: ***.<br> <br> I have contacted Avis to en-quire about the refund of my deposit on several occasions, in which they have promised to do the refund.<br> Up until date i have not yet received the refund.<br> <br> If i am not mistaken, this will fall under theft and is ********ly chargeable?<br> <br> If you organize to refund my deposit within 3 days i will not lay charges.<br> <br> Regards