You got to the VW Used Car dealer (not new) and say, how much for you to buy my least Tiguan.
If it is over their payoff, (which should be the same as yours), then you get a check for the difference.
However
If you don’t have at least 3 quotes from 3rd parties you will never know if they are cheating you.
Their number should be near the 3rd parties or within a few thousand. Otherwise you can make money buying / selling it.
Pickup buyout quotes from a radius of VW Dealer’s take the highest positive equity buyout and dump some into a new deal or purchase buyout yourself and sell to 3rd party. You’re allowed to just sell the vehicle to the VW Dealer and walk away.