How can I make a complaint regarding a Telus Truck driver?

There are 5 telus employees that live in a 1 bedroom suite in my neighbourhood.  They bring home 5 telus vans each night and park them lined up in front of the community mailbox.  They post a note in the window of each van telling people not to ticket them as they are working in a near by "building"but that is a lie.  Due to the fact that these Telus employees park in front of the mailbox, the postmaster refuses to deliver our mail so the community hasn't gotten mail in 5 days.  This reflects very poorly on Telus and has the neighbourhood very upset.