Someone named Brian has been calling repeatedly in attempts to have my business purchase advertising. After being told that we weren't interested, he got belligerent and rude, arguing that he was "trying to help us." I explained that if we needed help, we'd contact them back. After asking multiple times to speak to a manager, he offered to leave me on hold for 30 minutes while they were "in a meeting". Again, he argued that being in sales meant he can't take no for an answer... The last time I asked him to stop harassing me, and get a manager, he said he could leave them a note, and wouldn't honor the offer to leave me on hold for them.
Up until this point, most interactions with Yelp have been okay. This was the worst customer service I've experienced with any business.