Insurer cancelled policy, been driving 2 days uninsured without knowing. What can I do?

I feel like an absolute proper fool right now. I think I may have seriously messed up with my car insurance. I forgot to send in my NCB letter. They tried charging me €1880 twice via revolut. Been meaning to call them about it and just didn't get round to it.

I got an email after the first charge attempt to say they would be charging that amount but nothing prior to the first charge attempt. Then today I got the receipt of a refund with the effective date TWO DAYS ago. I have been driving for 2 days without insurance with no notice.

I know not sending the proof of discount is on me but is there a way for me to get them to reinstate the policy/not have it as cancelled? I tried purchasing another policy with a different insurer and now I cannot get insured. Also do I have cause for legal action seeing as had anything happened in the past 2 days I would have been unknowingly uninsured?