Get a second phone line and change the plan for the first, if necessary to the least expensive available with voice mail. Let your contacts know about your number change. Unplug the first phone but check the voice mail when ever you feel like it. After you no longer get calls from your contacts on the first phone you might give up the line. Then the person who next gets that number will have a surprise. It may be worth the extra cost.
I've had my phone number for 5 years and am still getting dunning calls for the previous owner. A side benefit from using the "new" number is that I no longer receive annoying "spam" calls.