Tanishq — Ring

I ordered a ring for my mom on her borthday to give her a surprise it was little big in her finger she went to tanishq store and said please resize this they said you would get it back after a month they called her and she went there she was told that would get a refund because they are gonna make it small instead she was charged more and they didnt even resized the ring it was still big in her finger and i bought that ring ao she can wear that in my brothers wedding and now she wont be able to wear it because it keeps falling because it is big very disappointed with tanishq this is my first experience and its really bad