Hi,
Window Nation seems to be a different company, not Microsoft, and no one here has access to accounts.
If the emails are genuinely from Window Nation, open one, scroll to the bottom, and look for Unsubscribe or Manage preferences. Follow the instructions to stop marketing emails.
If that doesn’t work, contact Window Nation through their official website and ask them to remove your email address from their marketing list.
If the messages look suspicious, avoid clicking their links and mark them as spam instead.