As you may or may not be aware, simply because telemarketers use phone number with a prefix corresponding to a respective city (in this situation, Anaheim, CA) doesn't mean those calls may be originating from those cities. In fact, in most cases harassing telemarketing calls originate in city/states other than the city/state where the phone numbers are registered to.
E.g. we actually tracked down more than a few of these types of harassing calls a year or two ago. One call in particular, also with an Anaheim, CA area code/prefix, was located in Augusta, Georgia. Another (Orange County, CA area code/prefix) was located in St. Petersburg, Russia.
Best measure is to report these phone numbers to the Do Not Call Registry complaints. Most folks comment that "Ahhh, I did that once (once! Wow!) and nothing happened." They don't want to make the effort yet they'll wasted time on these forums bitching and complaining which ... really accomplishes nothing. With the FCC Do Not Call Registry, it works this way: the people who report a particular number, the greater the chances that the FCC will do something. However, due to overzealous, misguided liberals, FCC NOW requires extensive documentation (reports) to take action.