Rajmal Lakhichand Jewellers — Diamond Jewellery issue

I had bought Diamond Pendant from Rajmal Lakhichand Jewellers 4 to 5 years back. At the time of purchasing they had mentioned that it can be Returned/exchange by deducting certain amount.
The Pendant is worn out now and its one of the part is also broke. I wanted to exchange it (most probably want to return it). But Most of the RL showrooms are closed now and I cannot contact them.

Also other jewellers don't deal with the Diamond jewelry purchased from another jewellers.

I cannot use the broken jewellery and nor I can exchange/return it. Please do the needful.

Thank you in Advance!!