I recently had an issue with my site being taken hacked and deleted.

I have since managed to get it back up and running and also added 2FA and backups.

I just finished a site scan and have identified a problematic plugin. So I deactivated it, tried deleting through WP, which failed. So instead I went to my FTP and tried to do it from there.

However it will not delete and I keep getting errors (which I think may be remnants from the hack). I can't even rename the folder or individual files.

I am at a loss here as to what to do next.

An example of an error I get. I have tried in different clients and still get the same issue.

Error:Could not delete button.tpl: Received error SSH_FX_FAILURE with description 'I/O error.'

Is anyone able to advise what to do? Even Wordfence can't delete it.