why i lost a d2 char randomly...

Did you have someone access your account recently?

You can always contact Blizzard support in-regards:
https://us.battle.net/support/en/help/

lol still cant get ahold of anyoen on blizz fucking dumb.

If it’s legacy that you’re referring to then your new character needs to be “permed” which means you’ll need a total playtime of 2 hours within 10 days otherwise characters will be deleted.