Used car bought, timing belts overdue, who pays?

Hello I bought a Galant 2.5V6 Bj98 m. 126tKm from a dealer two weeks ago. TÜV had expired but was renewed. Now my left front wheel (suspicious wheel bearing) from 40KmH hums. So I had it examined by the MitsuFachmann. It was established that the timing belt (which I didn’t know) was due for long in March 2010. I had unfortunately only paid attention to the kilometers when I bought the 6years I didn’t know I was driving at a free factory town. r meant because of V6 it costs with water pump 550€ oO Can I push the timing belt change to the dealer? achja that a wheel bearing change left with hours 300€ is ok from the price? thank you and gruss