NWJ is ruining my engagement

I purchased an engagement ring for my partner on the 3rd of February and needed it to be re-sized to a K and a half. They said it would take 3 to 4 weeks. After 3 to 4 weeks the ring comes back and it is not the correct size. The slip CLEARLY stated to re-size to K and a half but instead the made it an L. So they tell me they will send it off again and they do so.Eventually after 2 or three weeks NWJ phones me and tells me the ring has arrived, BUT IT IS STILL NOT K AND A HALF. STILL L!. Then the assistant tells me the problem is with my partner's finger! Blaming her finger instead of re-sizing the ring! Absolutely disgraceful. Then we agreed for them to send the ring locally for re-sizing which will take 7 days. It is now two weeks later and I have heard nothing until I made the effort to call this morning. The assistant promises immediate feedback yet hours later still nothing. So I phoned again and I get the same story. The \guy is not answering the phone, office phone is off etc. we will get back to you etc.\" All this does not help me. This is ruining a once in a lifetime event for me and my partner and ruining my planning. I cannot understand why this is so difficult. Pitiful."