No refund of rental deposit

This company has not refunded us the rental deposit of R5 600.00.The lease expired in December 2014 and inspection was done successfully as wellbas the keys handed in on time..My wife has been emailing them and they only gave us vague answers..They then promised that the money will be payed in before the end of the week of the 6th of February and still nothing happened.We followed up againg on the 10th and were promised that money will be payed in before the end of that week of the 13th..We still havent received it even 2day