Airpark Chrysler Dodge Jeep Ram

I bought my car 2006 Audi A4 2.0 T from this dealership Sept 27th after my previous car was totaled. I bought the care for a reasonable price and was told a thorough inspection was done on the vehicle. I've driven it since and have had no issues until I took it for it's 3K first oil change. I went to my trusted mechanic and they were servicing my car and noticed that I have a leak in my water pump. They stated that I will need to replace my waterpump and my timing belt. They stated to me that this leak has been there for a while because of the amount of water in the pan under it. They stated the reason i didn't notice any leak or drops on the ground is because it pooled in the pan below. Now I understand i'm buying a used car... I understand I drove it off the lot. I spoke to a manager of used car sales name Chris and I said to him I feel taken by the dealership because it's been 2 months and i'm having to essentially replace a major part on the vehicle costing me roughly 15% of the vehicles worth. He says to me there's nothing that he or anyone else at the dealership could do and that I should have inspected it before i bought it. To me this is poor customer service... This is great salesmanship hey sell a car no mater the condition even though they stated to me they did the 20/30/50 point inspection, however they failed to tell me that I have to replace this item within the first 2 months of owning the vehicle. My issue is i'm not a mechanic, i'm a consumer buying a car. If i knew all the ins and outs of the car and could have taken it to another mechanic to review then i would have. However I couldn't do that, and therefore this is why dealerships and Car sales people have a bad names. If you did what's in the best interest of a client knowing they know nothing about cars other than driving we would all feel better about dealerships and car sales people..... My issue is if you want a client for life, someone who is willing to buy cars from only you for as long as i live (Which is many cars) then treat me right and you have my loyalty.