Instagram: Freepik
Open the Instagram app on your mobile device.
Navigate to the messaging section by tapping on the message icon located at the top right corner of the screen.
Scroll through your chats and locate the conversation of the person whose calls you wish to block.
Tap on the profile picture or name of the person to open their profile within the chat.
Once in their profile, locate and tap on the "Mute" option.
From the options that appear, select "Mute Calls" to block incoming calls from this person.
Confirm your selection if prompted, and you have successfully muted calls from the selected person on Instagram.