Also, do you have quotas for user admin?
quota -w -s admin
I was able to touch the files
For the quota:
That output shows that user admin is using 169GB but the quota is set to 50000M (aprox. 50GB) so that seems the problem that you must fix.
Shoot…silly me 
must have been I tried limiting the quota from the control panel two weeks ago and then I set the wrong limit. I have done it in the CLI now. I tried using the v-update-user-quota cli command but maybe I was missing the options so I edited the quota file manually
Or how do I use the v-update-user-quota to modify the quota to a higher value, say 200GB?
I fixed it @sahsanu this was entirely my own fault…stupid me. So here’s what happened:
Few weeks ago I noticed one of the accounts had unlimited storage so I modified the package assigned to that user to 50GB, not realising that the “admin” was using the same package. So it messed the whole system up.
I should go get a stick and flog myself. I really appreciate you debugging this with me today. Sorry I took up so much of your time today 
So I ran apt install hestia --reinstall and then updated the quota manually using edquota admin, which allowed me to login to the control panel. I’ve corrected the quota from the package now so it works well.
Thanks once again, I appreciate the help.
Great, I’m glad you fixed it 