DNS leak issues are common among most providers. Sooner or later, it's bound to happen. One time is all it takes. What I tell people is to use a VPN just for casual unblocking, because that's all I can say. I've seen cases where FBI and CIA ave asked for records and VPN companies have provided it themselves because the users have been using it for illegal purposes. It's one thing to let's say unblock Netflix US from Kenya but a totally different thing to engage in activities like hacking, child p***ography and stuff. Just use a VPN to get around basic blockages and don't expect a VPN to have your back when you do crap like this... simple