Talk to a live agent at Microsoft 365

Firstly, I don't know if this is the correct place to ask, if not, I apologise, and would be greratful if I could be directed to the correct medium.

So.....

*** I am writing this on behalf of someone else ***

His account has been locked after he had been hacked and infected with a virus, and Microsoft will not unlock it. However, they have decided (today) to take his money for his 365 subscription, that he can't use, and doesn't want.

When looking for a way to cancel it, the answer is log-in to his account and cancel it himself. BUT, he can't log in because the account is locked.

He has tried looking for a phone number to speak to someone, but cannot find any.

He has tried looking for a Live Chat, but, (if it exists) it is only available after he logs in.

He just wants to cancel the subscription, and get a refund.

Can someone please give me a contact number - preferably in the UK, but any English speaking representitive, in any countrty will do.

Thanks,