Personally I don't know how good their current line of tablesaws is compared to what else is out there but have read here many tales describing setup and alignment problems such as yours.
Isn't there a telephone number in the assembly mannual they tell you to call if missing or damaged parts are encountered or do they tell you to deal with the local repair facility? In CA do you have the 90 days to return if dissatisified as here in the US? If yes then I would hold them to that. If the blade alignment issue and defective parts can not be corrected in 90 days take it back.
In todays market if I were to do it all over again and didn't want to spend the money for a full cabinet saw such as the Unisaw I would seriously consider a Jet, Powermatic, or maybe even a Steel City saw in the US$800 to $1200 price range and forget the low end entry level contractor models. The Sawstop is nice yes but even the contractor model starts at abour US$1500 which is crazy for a contractor saw I think. Any TS you buy in the 400 to 700 range will be at the same level of quality as the 4512 in my opinion. You might want to consider a good jobsite saw like the DeWalt DW748 or 749 or similar saws from Bosch or possibly the RIDGID jobsite saw but I think the deWalt is the nicest of this bunch. They run about the same in dollars as the 4512.