Check Engine Light On problems of the 2008 Audi A4

At 47658 miles check engine light came on dealer stated it was the camshaft & repaired at cost of $2007. (2/14) and same problem again at 60,711 miles at cost of $2305. There was a camshaft warranty extension (recall) for 10 yrs. 100,000 miles for same car for 2005 to 2007. My 2008 car was purchased 10/07 & would assume mfg. In 2007 which was the time period the camshaft problem existed and covered under that warranty. It appears Audi did not want to extend that warranty into the next year even though the camshaft problem still existed. The camshaft should never have to replaced at such low mileage once much less twice on a much less expensive car much less than an Audi. This is my third Audi and I have never had a problem before. To date I have spent $4300 in 2 years on something that should not have to be replaced. Your thoughts and assistance would be greatly appreciated.