poor workmanship

My Fiance purchased my engagement/ wedding set at Galaxy Kenilworth centre in January 2015. I had to have the rings made bigger and when I went to the store closest to me the saleslady insisted on what size was suitable even thou I told her it was to big, I had to pay for this to be done. When my rings returned it was way too big and kept sliding off my hand , hence we had to make it smaller and this too I had to pay for. now 11 months later the 1 accompanying band splits open in the middle and what does Galaxy tell me I need to pay to have this fixed Yet my set was only as year old and I believe firmly that due to poor quality and workmanship, I now have to pay again to fix what was not my problem to begin with. This is such pathetic service