How would you handle

Seems crazy to use Facebook but to me it appears that you called an awful lot. There were probably many other people calling and he just got flustered and didn't know how to handle the influx of calls/complaining. I would wait it out a couple of days if not the end of the week and then call and try to handle it. Patience always pays off in the end. Just my two cents though and I hope I didn't offend.