Xiaomi Redmi Note 4: unable to acquire unlocking bootloader permission

I've created a MIUI account through my Redmi Note 4 and applied for permission to unlock the bootloader through the official Xiaomi unlocking link. The problem is that after I enter my phone number so that they send me the code which I'd use to apply for the permission --which takes a lot of time to receive but I was patient and waited-- it gives me a pop-up message in Chinese in which it's roughly translated to: "You have reached the limit for this IP". Please keep in mind that I haven't signed up with many accounts from the same PC. I've tried another email, phone number, and a new MIUI account from a totally different PC and it still gave me the same pop-up message. I really want to root my device. Please help!