You can go to a new solicitor, of course, but they would need to contact the old ones to transfer files, histories and so on.
A lot of firms are still closed here. Our solicitors are working by phone (home numbers) and by emails with no actual face to face meetings as yet.
You are in Murcia which has passed to Phase 2 so may be opening again this week, we are still in Phase 1 so hence no office opening.
If these are the ones CIE Ademur then their contact page has a generic email address and personal email addresses for some of the partners.