Unable to close a personal account

I wish to close a personal Hotmail account but there is apparently a work email attached to it and so must remove that first.

I have not worked since 2012 and do not know what it is.

The one I thought it could be returns "no such domain known", or something like that.

I went onto chat and they could not help me, suggesting instead I contact Business Support.

I've tried phoning the published number but that redirects me to a dedicated online section for any option I choose.

Neither does the issue seem to fit into any parent category when trying to post this message.

I do not wish to get support for any product so am presently stuck.

Any advice or direction will be gratefully received.

TIA