I have an Ubuntu 16.04 server with ISPConfig Version: 3.1dev. and many websites installed (I know I have to update my system). I also have a website where I installed WHMCS. Whenever a client stops paying their hosting accounts are removed from the clients list on ISPConfig automatically with WHMCS. If they want their accounts back, I have to create a new one with the same domain name. However, after that their websites work again with the old account services (mailboxes, database, files, etc.). Why is that happening and how can I link the working websites to their new account services (i.e., it has to point to the new folder client88 instead of the old folder client74)?