Suggestion:
1. Call Bell to remove your number from the phonebook, it costs you $2/month. However, it works only next year since current phonebooks have been distributed to everyone.
2. Call Bell to apply a call display (caller ID) service. It costs you $8/month. You need a phone set with caller ID feature, or buy a caller Id display at $10. With this feature, you can see who is calling you. If it is a unknown number, or so-called "private", don't pickup the phone. If a number bothers you frequently, call police.