Action against Royal Mail and their thieving employee's

I've set up this group because for the third time in 5years i've had birthday cards with money in and a 50g pouch of tobacco go 'missing' whilst put straight into a Royal Mail Sorting Office post box. Straight outside so the mail CAN NOT go anywhere else but through Royal Mail Employee's hands. You can't complain by phone and your PC won't be able to load the complaint form. So what do you do? I'm not going to let this go this time...we've all seen the documentary's where stealing is shown to be rife in depot's. They ALLOW this to happen. My next port of call is the media so i want other stories for ammunition please