Perhaps try looking through your email for at least an order #, then, confirmation of the order being placed, and lastly, double check for the shipping confirmation. Was it together with another order i.e. you ordered both trousers together and only one arrived?
I have ordered twice now, recently, and have had good rapport via email.
I will order again FWIW as IME so far, Jamison offers the widest selection online that I'm aware of for RTW in various good fabric.