Depending on what phone you have and whether you can completely miss all calls. On a landline, you can either disconnect the line or turn off the ringer, but you don't want the caller getting any kind of answer. A call blocker may be of some use as many have offered praise for. Search for blocking apps for a cell and see what you can do to kill the calls. As long as there's an answer of some kind, your number may be a favorite to continue hitting. They're really easy to beat if you can do it.