If you want to cancel your Total AV subscription, you can start by logging in to your Total AV account and checking the subscription or billing section. I am not sure if uninstalling the app is enough, but usually, removing the software from your device does not cancel the subscription.
Once you sign in, look for your subscription details and check whether there is an option to cancel your plan or turn off automatic renewal. Follow the instructions provided and make sure you receive a confirmation email.
If you purchased Total AV through Google Play or the Apple App Store, you may need to cancel it through the same store instead. Also, if you have already been charged and want your money back, check Total AV's refund policy and contact its official support team to ask about your eligibility.
One more thing: keep your cancellation confirmation for your records. If you cannot find the cancellation option, check your purchase confirmation email to see how you originally subscribed. That should help you figure out the next step without wasting too much time.