I donĀ“t think zanz will change your password every month. I think he will not change it even once.
If zanz gets as many messages as SG , his email account is full of useful and useless stuff, and probably even password change requests.
Nobody of us can change passwords.
And there are many people, who would have an interest to do it.
If you could change this ingame, hackers could change it.
Better live with your password or reset account and create a new one (this way the old account could be deleted later).