This happens, and it is worth understanding why. When a physician examines your anatomy in person, they often find that the treatment you arrived expecting is either less suited to your tissue than an alternative, or that the combination you read about online does not match your actual clinical picture.
The recommendation will be explained - not handed to you as a take-it-or-leave-it directive. You will understand the reasoning before anything is agreed. If you have a strong preference for a specific approach, say so; the physician will clarify what the clinical tradeoffs are.
Nothing is performed without your informed consent. If after the consultation you prefer to go elsewhere or think further before proceeding, that is a reasonable outcome.