I would choose an domain which you can ping through the vpn and run traceroute against it. Then run the traceroute just through your normal internetconnection.

I would choose an domain which you can ping through the vpn and run traceroute against it. Then run the traceroute just through your normal internetconnection. Save the output on BOTH. The next thing is contacting support via mail. On the phone its easy to say that you didnt do step x and hang up. Emails can also be send to responsible people, so it can reach the second level much easier.