Club Factory — defective order

Address:

Bangalore, Karnataka

I had ordered a jewelry item which is delivered on 16th Apr 2019 with order no. SO[protected]. But found that item defective. The chain is cut, so cannot be used.
Would like to replace the item but could not find any link to return from the order mail.
How to return the item, please provide details for the same.
It would be good to have such date in the order email itself in future.