Poor service - lack of response

I recently purchased a set of Osram Nightbreaker head lamp bulbs for my car. These bulbs come at a hefty premium but based on excellent online reviews I made the purchase. To my dismay I found they were no better than the cheap bulbs from my local automotive spare shop. I contacted Osram Head Office in Midrand and was informed the Executive in charge was out of the country on business, but I could email him directly. He would surely respond in a few days. Well this was almost 2 months ago and no answer from him.