How to remove connectors from the mirror plug?

[Vark]

I did 3 installs of back-up cameras for my friends, no problems and everything was fine. I was doing an install today on another H2 and wired everything before looking at the mirror itself - it was a new style, with LED screen in the mirror, not slide-out from the side, so the wiring into the old mirror plug is a bit different. But now the problem is - I cannot remove the wires from the plug to reposition them - I did release the white lock half way, but the connectors on the end of the wires are still locked in. Any help will be appreciated.
Thanks