I returned the items following their instructions. Items have been received as per the tracking but Uniqlo are claiming otherwise. After over a month of disputes, luckily I had paid by Paypal to who I sent all evidence in hands (receipts, photos, and communications) so I opened a case against them. Uniqlo sent me an email stating that they'll will not refund me unless I close the case with PayPal, the crooks. Luckily, PayPal rules in my favour and got all my money back. Thanks to Paypal.
FYI, Uniqlo online is a separate company and management that Uniqlo stores. If you are adamant to buy Uniqlo products, shop in their stores and avoid Uniqlo online like the plague.