Who can I contact to reset my profile?

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Good day! A few years ago I checked online http://www.steinberg.net. There I registered Cubase 4 activation code, and eventually Cubase 5.
After some time, my inbox broke, and my hard drive on MDM I kept passwords broke. When trying to restore your profile, the new password is sent to the hacked my mailbox, which I unfortunately can not go.
How can I recover my old profile? Or where do I apply?

info @ steinberg . de explain the situation.