Damaged Pendant

My partner bought me a beautiful amethyst pendant/necklace from Harris D'Arcy Jewellers on 03.01.16. I couldn't wait to try the necklace on as i have always wanted something like this and was so dissapointed when i looked in the mirror and noticed that 4 little stones were missing. We agreed that we would return the necklace to the Jeweller to swop for another pendant as they had two in the window. My partner returned to the jeweller today, 05.01.2016 and was accused by the owner's son of damaging and bending the pendant that is why the stones fell out!! My partner was so angry and couldn't believe what he was hearing, I phoned the jeweller to find out what was happening &amp