Are you a German resident or otherwise subject to their jurisdiction? What would happen if you just ignored the lawsuit, and/or ignored the final judgment?
Eventually they'll sue you for damages, the court will rule that you have to stop what you are doing (as they already did so, and violating a court order seems like a surefire way to escalate the situation), plus the monetary compensation for the damages. And at that point it's just easy-peasy call the collections agency, and they'll just make your life more and more miserable by taking your stuff/car/home/etc. (Similarly if "you are" a company.)
As a company, they can only take what belongs to the company. Even if you're selfemployed they should only be able (IIRC, IANAL) to take things that are 100% part of the business.
That's because in that case the legal entity of the company and the natural entity behind it are the same. A GmbH and similar are not directly associated with that. The quick way to prevent issues is to quickly register private insolvency if the money of your corporation is not enough to cover your bills. That means you get to keep a profit of 1.178,59€ monthly plus any necessities like rent and gas/power bills. At most this takes five years and you're free.
