Unhappy Customer - Treated Poorly

What was supposed to be the most romantic and special symbol of love, was ruined due to a factory fault in the ring my fiance purchased from NWJ. The entire centre piece with ALL the diamonds came out while I was playing in the garden with my son - I have since not found it. A ring that costs thousands should not so easily come lose like that! I took the ring in to ERM NWJ with a valuation form, and was told they should have the invoice but will gladly assist with the valuation form - 2 weeks later I was told I can choose a ring to the same value. Now in my mind I had the value on the valuation form - I am in construction, not jewels, so I wasnt aware that this amount is not the same as what was paid. I went in to the store, only to be told they need the invoice first, and its from East Gate not ERM, They obtained the invoice, which had still been discounted, so I had to choose for only half the amount I had in mind. I understand that I can only get something to the value that was paid. My argument is that I was given the wrong information. Sales reps should convey information correctly, and keep a customer informed at all times. I started to complain about this, only for the Manager to walk out whilst I was complaining. In my experience, when a Manager sees an unhappy customer, they should step in to assist. I proceeded to choose a ring within budget, had to pay in the balance, but no apology was received, no attempt to calm me down. Instead I was treated as if I am an inconvenience! I was told I am in the wrong, and how can I not understand I get what I pay for? AGAIN - MISINFORMATION TO THE CLIENT CAUSES FRUSTRATION. Will never support NWJ again!