Seems like a boost issue to me. Had one a while back and was tearing my hair out thinking the turbo was nadgered.
Did the car seem more smokey than usual before she went into limp? Does turning the car off then on again solve the issue at all?
With you saying it was lagging i'd say it's underboost. While you're waiting for someone with VAGCOM have a scout around all the intercooler pipes. There may be a leak somewhere. Have a good look around the whole of the hose. I missed a split in mine and that was the cause.
Look around the vacum hoses too. These can go brittle and break giving you boost issues. These are along the bulkhead. Check near the N75 valve too. That's your boost solenoid. A quick google will point you to where they are.
I've had another scout about, anda dodgy MAF can also prevent boost too.
Sometimes it's a simple fix mate, so worth checking the basics first