Diamond falling

I bought a ring and within 30 days one diamond fell. Went back to the store to return the ring as in my mind if it falls now in a year I will have diamond less ring I requested full refund. I was told no they will fix it for me and it will be as if its brand new and they will tighten all other diamonds. Took them from the 4th till the 28th of July to fix it.

Upon the return of the ring I noticed that the 9ct that was written in the inside of the ring was no longer there. The ring seem to have been done new but I could see the one that was fix it had a bit of darkness. After wearing the ring the diamond became darker and darker . My ring looked awful.

11 November went back to return the ring again. Am told there is not enough cash to process, next thing am told it going for quality as they would need to return the ring to the floor they must know what is wrong. That has nothing to do with me, give me my money. The girl who assisted me did not take me serious as she kept laughing, She refused to call her manager until another colleague told her to. I am sorry I cannot have a new ring that barely finished 30days without any problems. Your policy Cleary state that we must return the products. I want my money Sterns your product was not up to the Standard I thought it was.