PX AI Chatbot & Contact Form

I installed this app to try, but I chose not to keep it and deleted it. But it left code in my theme. The contact form still pops up sometimes even though the app is no longer installed. I cannot re-install the app as it fails to do so. UPDATE: thank you for your fast response and for the solution. I've done as you suggested and removed the leftover code so hopefully all is ok now.

Really love this app! Super easy to set up and it runs smoothly. The chatbot talks to customers like a real person, and it's been helping answer questions and recommend products without me having to do anything. I've definitely noticed more engagement and even a few extra sales.