Engagement ring broke after JUST 3 weeks

My fiance bought my ring on 18 Nov 2017, and only proposed on the 23rd of Nov. Before i started wearing my sterling silver ring, i phoned American Swiss to find out how not to damage my ring. The lady advised me not to wear it while working with water or any chemicals, thus i only wore my ring to work and special occasions. NEVER touching water with my ring on my finger, as i dont want to damage it. 3 weeks after the proposal the gems started falling out and the silver at the bottom of my ring is off, only showing metal. I immediately notified American Swiss via FB about my complaint and took my ring back to N1 City store where he bought it. My ring was booked in for a quality check, and the end result seems to be unknown as they could not pick up any damages from my side, so they gave me the benefit of the doubt of chosing a new ring or full refund. I absolutely love my ring, so ofcourse i want my own ring back, but I can only have it enlarged at the end of January at my own cost, AGAIN. The leist they couldve done is to have it enlarged for free, hence all my dissapointment. So now im ring-less for a whole month again, and i have to pay for enlargment. Ill never ever return to American swiss after this, this is absolutely TERRIBLE.