Its actually for a Cartier W10172T2 Circa 2006

Hi,
I have a pre owned Cartier of this model W10172T2, I have been given a serial number on an authenticity certificate which I have no idea wether its true or not as I cannot find a serial number printed anywhere on the outside or inside of the watch to match it.

secondly I cannot get the 2 side chrongraph buttons to actually sucsesfully operate the 3 chrono dials with any sense, the 10 oclock and 2 oclock located dials just randomly roll around to no where in particular, the dial at 6 oclock seems to work but have no idea how to set this in align with the second hand, is there an instruction manual available? are the chrono dials faulty? please help, your advice would be very much appreciated. I am puzzled.
regards
george