Don't you just hate when you connect to a VPN and windows starts using the VPN credentials. here's the fix.
navigate to %userprofile%\AppData\Roaming\Microsoft\Network\Connections\PBK
Edit the vpn's .pbk file by opening it with notepad.
Find UseRasCredentials=1 and Change this to UseRasCredentials=0
i've used this method in Windows 7 and WIndows 10
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South Hawk Computing LLC Owner
Any advice / recommendations given on this forum should ONLY be preformed at the user's own risk. South Hawk LLC does not offer any guarantees or warranties when a user attempts to try these fixes on their own. We are NOT responsible for any damages that may or may not occur to your devices.