Clarks — Clarks shoe

Address:	500032
Website:	clarks.in

Hello team,
I have made a purchase online from clarks.in. i got my product on sat (9th july). the size 5 doesn't fit me well so i want to exchange it and get it replaced by the size 4. i have been calling the customer care since morning but no one is attending my calls or called back. i have already written 3 mails; but no reply yet and i am supposed to contact the customer care within 72hrs. my time is ticking.
I am very unhappy with the customer care services. please help me through it. i am facing lots of troubles here.

Thanks monika