Robokiller

After I realized that robokiller isn’t not free I decided not to get it. I am stuck now since I did not choose to try the free trial nor did I start a subscription for this app. I cannot stop the subscription since I never started one. Nor can I uninstall this app. How do I remove this app without accepting the free trial. I tried all the easy ways to do this but no luck. I truly appreciate any help and/or suggestions. But I really don’t want to start a subscription just to remove this app. Thank you.