Did you check the bowden cable ends? Do you know what those are? THey are the plastic pieces at the end of the shifting cables that tie into the top of your transmission.
Make sure all the teeth are there and that there is no movement on the cable ends once the locking mechanism is engaged.
take a flashlight and see if you can see the screw in the door jamb that is used to rotate the retaining clip. Is the screw in place? is it in or out?
If it's in, you need to unscrew it out. If it's already out, then you just need to tighten it.
Here is the screw and the "clip" it...
Speakers are at the brown 8-pin vw connector or "middle ISO" in the diagram above
Pin 5 & 7 use positive connection on the bus bar terminal 30
pin 4 from the black vw connector is S-contact use the cluster harness to get S-contact
Blue cluster connector pin 30...