Get VW to do a full geometry set up, but only when you have 4 new tyres fitted.
Mine had new tyres on the front and the originals on the rear that had worn on the inner edges due to the alignment been out. I had new tyres fitted to the rear. After having nothing done but the new rears fitted, the steering wheel was off center by a few degrees when driving straight ahead. This showed that the now "square" rear tyres had altered the geometry to such an extent that the car was crabbing. Of to VW for a geometry set up (about £100) and now everything is just as it should be.
Around the same time, a bloke I know with the same car as me was having the same rear tyre wear issues. He did things the wrong way round. He had the geometry re-aligned at VW then fitted new rear tyres. Within 3000 miles, his front tyres had worn to the canvas on the inside edges. He took it back to VW and pulled his face and after lots of arguing, they fitted two new front tyres and re-did the alignment FOC.