Myntra.com — Exchange delayed for no reason

Exchange is stopped saying that my product is deffective. But the product is too small in size(size 30) and that's why I have ordered 2 size bigger(size 34). Prize tag is intect. I was not at home when the Myntra person came. So i want to know why they are not exchanging my product. Trying to call Myntra customer care since 21st April. They do not call back. It is pathetic.