Why, is your ex spouse constantly nagging you? : P You can easily block someone’s number by either using your service operator or your phone itself. Call your service operator and ask them to block the particular number and they do it immediately without any charge. This is a permanent solution and you will not receive any further phone calls from that number anymore. Another option is to block the number using your phone. Some phones have this option. If none of these work just ignore the calls or change your number. Hope it helps.