you triggered the anti-cheat which gave you the first 7 days, and then you tried to bypass the ban with a new account which gave you the second 7 days. you'll just need to wait out your ban.
A couple of things for next time:
If you want to do things that trigger the anti-cheat, you need to launch in LAN mode. It is still turned on in private / custom games... the plutonium anti-cheat website page is very clear on this (it's in a big read box that you can't miss)
You can also load mod menus the plutonium approved way that doesn't trigger the anti-cheat so you don't have to worry about LAN mode.