I’ve heard this tried….. I’ve never done it…… pull the battery cables off and touch them together for 30 seconds , reconnect and see what happens.
Second thing to try , again I’ve not done it , is to go to the on position and let the car sit that way for 30 minutes, then try to start it.
Both above items won’t cost you anything but time .
If that doesn’t work you will need to get ahold of an original version of vagtacho and get the SKC ( secret key code ) from the cluster , then use Vcds to reprogram you keys to your car. If you don’t have acess to the above you will either need to go to a
1- vw dealer
2- lock smith
3- find someone who has the equipment and do it for you for a fee.
The above three will cost you from the most expensive to possible the least expensive. Just my .02