Check your error logs to see what messages are indicated there, if the timeout or 503 is occurring on Roblox's end with their server(s) giving that response, then the issue would be on Roblox's end.
FYI, Argentina has been on the blacklist for quite a while now, about 3 years. Existing accounts are eligible for review for an exception as the error message directly states. Would you like it reviewed for an exception.