If the pants you got from Uniqlo came damaged, the first thing you should do is call customer support. You can either call them or send them an email outlining the problem. Please include your order number, a description of the damage, and, if possible, good images of the issue.
Next, inquire about your choices for a replacement or refund. If the item is still available, you can request an exchange, or you can return the damaged pants for a full refund. Make careful to ask about shipping fees and how to return the goods.
After contacting them, follow the directions provided by customer service to return the damaged pants. Keep a record of all conversations and monitor the status of the exchange or refund.
These are key methods that we can offer. If you have more, please share.
