Eve, another way to look at it is, your colleague was presenting the companys product to the customer. Even tho you may have created the work product, its not YOURS, it belongs to the company. Thats not unethical in any way. You were asked to present it and you refused, so they asked someone else to present to the customer. The customer doesnt care who in your company actually does the work - they pay the company for the services, period, correct?