Check whether your landline service offers call blocking
Contact your phone provider and ask for call blocking options
Use your phone’s built-in call block feature if available
Add the number to a call blocker device connected to the landline
Enable anonymous call rejection if the calls are private or blocked
Set up selective call rejection through your provider
Save the blocked number in your phone’s block list if supported
Ask your provider to block the number at the network level
Use call screening or call filtering features if available
Replace the number with a new one if blocking is not possible