Siri interrupts despite being turned off on iPhone

Go to Settings > Siri (or Apple Intelligence & Siri). Do any of the following: Prevent Siri from responding to the voice request “Hey Siri”: Tap Talk to Siri, then tap Off. Prevent access to Siri when iPhone is locked: Turn off Allow Siri When Locked.

Change Siri settings on iPhone - Apple Support (IN)

Can you elaborate on what feature of Siri that you have turned off?

Siri is a feature built into iOS, not a standalone app. It's deeply integrated into the operating system, allowing you to access it from various places and use it for a wide range of tasks.