Joyalukkas — Online purchase send with broken chain and Joyalukkas is not responding after I did payment

I have made an online purchase of gold chain in Joyalukkas website . After I made the placement they called back and said that the chain that they hold is having some extra weight so I need to pay Rs.2000+ extra to dispatch it . After multiple calls I have paid that extra amount too. Then I have received the parcel with a broken chain and I cant use it for a day too. Even the chain lock mechanism is not working properly. I am writing multiple emails and calls but no response yet. But untill I make a purchase and do payment they promptly respond for all my emails immediately. Now I am helpless and have no idea how to contact and get this issue resolved.