Known issue with the VAG central locking. There is a photo set of how to drill it open on one of the forums somewhere.
You would have had more luck trying when it first broke. I managed to get mine to open one last time by cycling open closed again and again and again . ... while bashing the door handle with my fist. Then taking it for a drive, then doing the open close bash some more
Once I got it open I disconnected the cable and the outside handle so it would not lock again until the dealer had the new lock. £120 I think.
There is a screw hidden under a gromet on the side of the door you will want to know about when you are try to hook the bloomin cable back up.