What is wrong with your car, and why do the mechanics suspect the ignition coils? Did they test them?
If your car was serviced under VW warranty, it would be subject to VW Service Circular, Number VWA-02-13, dated Novembeer 13, 2003. This tells the mechanics to only replace ignition coils which show fault on the test equipment printout.
Technical Bulletin, number 03-02, dated FEB 27, 2007, Subject: Ignition Coil, Misfire Diagnosis, details how to test the ignition coils for misfire.