Bad jewerly and Bad service

I am very unhappy with a white gold princess cut ring that I bought for my wife.I kept the ring for 10months after purchase then I proposed to my wife.after about two weeks ?of her wearing the ring it cracked in two places on the band,we went to edgars canal walk to complain about it and they didn't want to do anything about it, we then got a excellent jeweler to come back to edgars with us to complain about the ring.She said there was porosity in the metal.It's is a fairly common defect when you manufacture jewellery by casting it,that's the cause of it cracking.After a huge fight with edgars and the manager they decided to take the ring in and repair it(the manager was very rude at edgars about taking the ring in for repairs)my wife wore the ring for about 9 months after that and then packet it away until our wedding day which was 29 November 2014 then my wife wore the ring everyday and took care of it for,on Wednesday 15 july 2015 my wife discovered that her ring had lost two diamonds due the the claw breaking off!We have been to a few well known jewelers to take a look at the ring and all of them say the same thing that the ring is Very Badly Made. Something need to be done?