Got Ph.D Degree from India on the basis of Ph.D Comprehensive Exam + Ph.D Thesis now thinking of doing Course Work in another university
If you are planning to take a big step of re-doing a PhD just based on this one interview you had, then I'd recommend reconsidering the thought. Have you received similar responses in the past? If yes, then may be the university that awarded you a PhD, doesn't has a good reputation. In that case too, a second PhD is not the best option. You can think of some Post doctoral certification or Post-doc research work. That would enhance your profile and would not count as a repetition.