You were suspended for creating multiple accounts, which is against our terms of service (https://wiki.helionet.org/hosting/terms). Which account do you want to keep?
I've unblocked your IP address. I've never used Plesk's users feature, but you can change the FTP credentials in the "Connection Info" page under "Websites & Domains".
An administrator can look into this for you. It looks like your account storage space is still 2000 MB, so it might be an unintended side effect of the recent changes to email.
I've added both subdomains for you, they should take effect in about 20 minutes. To the best of my knowledge, it's not possible to change where files are loaded from for a domain in Plesk.
Domains added, they'll take effect in about two hours. You'll need to create A/AAAA records for each domain, pointing to Morty's IP address (or switch to HelioHost's nameservers).
Domain added. It will begin working in about two hours. You'll need to create an A/AAAA record pointing to Tommy's IP or switch to HelioHost's nameservers.