That sucks, but my friend.

When dealing with people remember we are all humans. Know when to keep your cool. If you explain the situation with honesty and remain calm and dont get to aggressive usually things will work out.

Its a business not a street hustler.

I understand your frustrations and believe me im with you. Always Always! Call back and speak in person voice mails are a cop out. If your being real dont leave any details on the Voicemail just say "hey its john please call me back we need to speak".

It will work out if your being honest put yourself in their shoes, Easy trick for someone to try and pull by scamming THEM on a bulb.

I would ask him if that bulb had been sent back from someone else or even been opened or maybe a floor model? Well good luck and maybe check back with him in a day or two just to show your being honest, Good luck.