Clarks — Defective Shoes & Improper Material

Website: Clarks.in

I ordered two pair of shoes from the Clarks website. I've been trying to return them as one pair has right side shoe bigger than the left side. It's clearly visible that it's defective. Whenever I'm trying to submit the return online it gives error. The shoe is quite expensive( 7499 Rs) and it's really shameful that Clarks is sending defective products to it's loyal customers. I even tried to call on the given customer care no but no one is picking the phone. When a guy picked up the mobile no given as customer care no he told that he's doesn't work in Clarks and it's his personal no and not Clarks customer care no. Another pair is made of nubuck leather and I can't wear it, so I want to return this but the return process is not functioning and giving errors.
Kindly help me.