Ordered like everyone else, and a delivery was "at...

Ordered like everyone else, and a delivery was "attempted" yet the people who were home at the time, and were actively waiting for the package didn't hear a knock. I usually would be suspicious about how attentive the people waiting were, but then it happened a second time, and seems to be a constant with Purolator from the reviews here. Don't use them. I've ordered 2 things and my girlfriend ordered 1 and all three managed to miss being delivered. How is this possible when the previous delivery companies have never missed a single order?