I want to know why I was suspended/killed, whatever the terminology.

on what server? if you got killed by other player(s) then you grabbed or did too many harmful ops, if you got deleted then you broke some rule (contacting mod who mods that server can give you answer why were you deleted).

?

I DID contact the mod and appealed the deletion and he didn't even respond......just sent a note saying "appeal denied"

We're supposed to be playing a fun, open game and he won't even talk about why I got booted.

there are many possible reasons why did you got deleted. think what you did before deletion and figure what caused deletion and next time don't do it.

What server?

which server?