United Colors Of Benetton — bad quality sweatshirt

I brought a sweatshirt through online shopping at end of january this year.
First day it was good in colour and fitting also but after washing it two times, it colour fades very much and it also become too much loose in hands and from shoulders. Not it looks very bad and very loose sleeves.
Some days before i went to a benetton showroom, they ask me to complaint about it online.
Earlier i used to buy benetton products but after that sweatshirt my trust comelety end.
Please do something in this matter.