I'm working in a instrument manufacturing company now. There are only product manager now, my colleague and I. Our manager had already assigned responsibilities for both of us when we join this company.
My background corresponds with all products in this company, in both collage and past working experience. However, he only knows how to operate the instruments, but does not know all the fundamental principles.
At first, I was angry about his behavior - constantly interrupting whenever I'm talking, describing wrong concept/workflow/principle to customers and taking over my product line.
In fact, he really is a nice guy, and is very friendly to me. I think he's not aware that he's doing something makes me uncomfortable. So I decide to keep a little distance from him.
Yesterday, someone called him for instrument calibration. According to his conversation, I instantly know the customer owns a product I'm in charge of. However, not only did he not pass it to me, but kept talking wrong things to that customer.
For instance, he said "Well, we don't provide calibration service for such product, since this product isn't that accurate as [his products]."
However, both products have exact the same accuracy. The only difference is that mine is designed for handheld use, and which will contain unavoidable error caused by user. But if its setuped on a tripod, there will be no significant difference on accuracy compared to his product.
Getting more and more upset about this, but don't want to cause any damage to anyone. What should I do?