After using a VPN set to the United Kingdom or visiting the country, your account’s location remains locked to the UK, even after several months. The UK is the only country that appears to cause this problem (what i know), this is a problem caused by the automatic account location system, which also prohibits buying robux in local currency, i hope this gets fixed 
No Browser Information/System Information included as this isn’t a browser error neither a system error.
Side Info:
The ID I verified My account with is Moroccan, my account was created in Morocco, i’ve asked for help many times from Roblox Support, and they refused to, and told me i should just wait more.