Return it yourself.

1) if you are a big guy, they have the sizes but if you are a big guy with strong arms dont bother. Like their models its for small people.
2) if you have to return something read through the returning process because they dont tell you straightforward that when you return something and you use their return label they deduct it from your refund.
3) Not only are they going to take half your money. They also tell you that it will take up to a week to get back half your money that u spent on their small fitted product.
4) I sent the product back probably a week and a half ago so now I have to wait longer to get half of my money back.
5) now If you have the option to return it to the store do it.

Rosacuellar about H&M, v2.16.0