Lost Gear after Class Change

I did a class change from tempest to bk in my PvP gear to test BK build in BG. I did not like the outcome of the class change so the next days I change classes back to tempest. Upon returning to tempest class 3 of my PvE gear items that were in my dungeon loadout were missing. I did not salvage any gear while I was BK. I spent countless days and hours trying to grind for the most suitable gear for my character and I am extremely frustrated by the missing gear. My DPS has suffered a significant setback due to the gear disappearing. I reached out to support about the issue and they said they could not provide any assistance due to the game being free to play. My account is far from free to play as I have literally spent THOUSANDS of dollars on gearing up my account. How do I get my gear back, as it was an in game mechanic that somehow deleted my gear?