I would tell them that I already had it, and that I know they have incentives to reach certain vaccine quotas. I would definitely find another doctor, as they clearly do not have your interest in mind. Doctor's get PAID incentives to push vaccines, so they have no motivation to get educated or listen to the patient. It is a grotesque situation, and vaccinations do far more harm than good.
Nobody will ever stick a needle in my arm again, unless it is in a trauma situation and I am unconscious. Besides, I have CS, and haven't been sick since (15 years). Obviously nothing better than CS. Victor