Can’t receive emails at my outlook account

I have a bought hotmail account (*** Email address is removed for privacy ***), which can't receive any emails from one at the other day.

I had used for few years without any problems, but suddenly all emails sent to this account were bounced back with an error statement: "failed to receive".

No setting was changed. Even at Outlook.com webpage I can' receive any emails.

Please help

Rgds,

Geoffrey