Quantity not as stated on container

Purchased this product from B-Trust in Mississauga Feb 16, 2018. Noticed lately the content quantity is less so I measured the weight when I got home. The container states the content is 16 oz (454 g). On the scale the weight was 318 g including the container. I'd say that's a lot less product than advertised. I will consider a formal complaint to Federal agency because these companies should not be allowed to get away with this. I only continue to buy because is is admittedly good tasting.