Biba — Return is not done till 3 weeks

I purchase kurta set from biba which are deliverd 30/6 and it didnt feet me well thats why i returned it 5th july and today is 24th i still not get my refund...mailed so many times but they only mail that 24 or 48 hours they will refund my money but its not worked...my ref no of return is
24549393