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The best course of action is to have good insurance in place to cover incidents such as this.
However, you cannot prevent someone from suing you, and if there is no insurance coverage, you'll have to defend it.
But, if the litigation is frivilous and done only to harass your business, you can file a counterclaim against the company under the litigation accountability act, which allows you to recover damages, including attorneys fees, for the other company bringing this bogus lawsuit.
Right now, everything is going back and forth and the litigation is frivolous. Is there an oversight board or association that can help? I've got the attorneys working on this, but there appears to be no end. The other company is drumming up strange complaints based on old internet laws. How can I end the madness?
The oversight board for frivilous lawsuits is the court system itself. If you've got attorneys pursuing this under the litigation accountability act, that's really all you can do.
Hopefully, they will prove that this suit is bogus, and you'll be awarded attorneys fees and damages for their interruption/interference with your business.