Using classic Outlook for Windows in business environments
Hello ! I'm Nelson and I would be glad to assist you today, I'm sorry that you are experiencing this issue.
To block someone in Outlook.com, select the messages or senders you want to block.
From the top toolbar, select Junk > Block (or Spam > Block).
Select OK. The messages you select will be deleted and all future messages will be blocked from your mailbox. Hope this helps
Nelson