Pepperfry — Defective Writing Table: Not refunding or replacing

I purchased a writing table from Pepperfry in July. They delivered in August that was a defective piece that had missing parts and could not be assembled.
I requested them to replace parts and assemble however I did not hear from the vendor or Pepperfry.
Post that I requested them to take back the product and return my money for which they said they can only refund if the vendor takes the product back.
Now they have no control over when the vendor will take the product and they are not refunding my money.
I am stuck. Please assist.
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