Currently of work due to fleeing Domestic Abuse, informed work change of address and to NOT send any mail to my old address (ex's hime ) . Long story short - private and confidential mail was sent to him by work several times after informing them not too! I have had an apology, but ex opens all my mail and weponised all the contents, bombarded me with texts, phone calls regarding the content! Probably I would be back in work by now but it's caused me so much stress. Shall I go to hr? Union? Legal route?