Good approach. I was mean to them when we broke up. I asked them for a list of the promises they told me. Then I shared it with them. I played them recordings of their own sales people telling me x or y was gonna happen, then pushed for answers why those things weren't happening.
I learned people don't want to hear their own voice saying "don't worry nick. X is completely taken care of" after they saw X never got taken care of.
They call every few months. I lay into them pretty good about what the notes say to my account and then ask them why they insist on calling me.
I hate liars and time wasters. Home advisor, for me, was both.
love
nick