Here is a small but growing list of agencies and institutions you can report your negative experiences with Lawnstarter to. Your state probably has a state-specific reporting portal as well--we may eventually catalog those but for now just Google your state + report a business to find it.

File A Complaint With the Better Business Bureau

Report Fraud to the Federal Trade Commission

USA.gov Guide to Consumer Complaints

Consumer Federation of America Guide to Complaints

Further please leave reviews on all of your favorite review sites!

Post to your social media--let your network know about your experiences!