Malabar Gold & Diamonds — poor quality and service

Address: Vadodara, Gujarat, 390016

We had purchased real diamonds ring from malabar showroom (Racecourse circle) alkapuri, vadodara.
We were told that ring and diamonds are in warranty for lifetime. From the date of purchase diamonds are detaching from the ring due to poor quality (3 times in 3 years).
Now they are charging 800 rs for the same.
This is an engagement ring can’t exchange or replace (800 multiply by lifetime is the cost of maintenance) not worthy