Aurelia — defective kurti

I purchased aurelia kurti from ambience mall, gurugram on 8 march 2019. I tried small size and purchased a new piece of small size which was packed. Before function when i wore that kurti, it was almost extra large size and on price tag and kurti both small size is written. It is clearly a defective piece. If i would buy cloth from some local store in low price then i would definitely have tried that piece but it was such a big brand and good amount of money they are taking i didn't even think that this can also happen. I don't know what to do now?. I don't live in delhi, can i exchange it? If yes then how and where? Do i have to go to same store? Is there any time limit for exchange because there is no aurelia store in my city. What should i do now? That kurti already ruined my mood that day now at least i want to save my money, please tell me what should i do now?