Ironically it was nothing you did. Unfortunately for you, you're in a country where everyone thinks they're an elite hacker, and thus poison most the IPs (blacklist them) by running kiddie scripts. Turns out you just inherited one of these IPs (as you have dynamic IP) - do a Google search of your current WAN IP, or even just enter it into this generic engine
https://whatismyipaddress.com/ip/, and you'll see what I mean!