Happened on my Leon, when I was on holiday in Slovenia.
It’s a well known fault over practically the entire VAG range afaik? The mech is basically a load of plastic and a bit of steel wire that gives up.
Think I paid about €150 to have the entire mech replaced. Perhaps it’s cheaper if you can find the 1 broken bit online, and suss out how the frick to get the door apart. I gave up, walked in to the nearest dealer in Slovenia, and the issue was so well known that he was checking the stock before even taking a look at the car, or even which side it was! (I guess 99% are drivers door, due to being used 2x per day for parking barrier etc.?). Part was in the next morning, and car was collectable maybe 2 hours tops after dropping it off.
Don’t forget to make sure the code is cleared afterwards, else every time you take the car in for MOT or whatever they’ll tell you you’ve got a failing door window mech.