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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 16.0.0
Operating system and version (eg, Ubuntu 17.04): Ubuntu 16.04
Apache or nginx version (eg, Apache 2.4.25): Server version: Apache/2.4.7 (Ubuntu)
Server built: Apr 3 2019 18:04:25
PHP version (eg, 7.1): PHP 7.2.17-1+ubuntu14.04.1+deb.sury.org+3 (cli) (built: Apr 10 2019 11:16:39)
The issue you are facing:
Basically when I wanted to expact the users storage limit I increase it to 10GB or unlimited and the default stays active and cannot be expanded I get this in the users bottom left corners. Show’s 5GB not the updated value 10GB or unlimited.
New limit set for the user in the admin panel as seen here in this screenshot: 
https://www.dropbox.com/s/mwxyozc00d344gf/Screenshot%202019-11-18%2014.16.20.png?dl=0
When you go back as the user in the bottom left corner you see it still says their limit is 5GB. It would appear all the user have their limit stuck at 5GB.
https://www.dropbox.com/s/amtlq9zn62mqp27/Screenshot%202019-11-18%2014.14.28.png?dl=0
Is this the first time you’ve seen this error? (Y/N): YES but then again we have never increased a users storage, users only starting the reach our default storage limit!
Steps to replicate it:
- Upload data to the limit of 5GB which is one of the options
- It will say you have reached your limit and try to update a users limit form the admin panel
- Go back and try to upload frmo the users perspective and the file storage limit is still the old 5gb!
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE