Henry's staff are not trained technicians. That said, many associates will be able to guide you as to the best way to calibrate your lens. Please don't hesitate to ask for assistance!
Calibration is a service that would need to be carried out by a repair depot or in many cases can be done by any individual. There are tools available to help in calibration.
Many newer cameras have built in menu functions that can allow the user to perform lens calibration directly through the camera. Depending on the camera brand this function may have different names such as 'micro-focus adjustment' or 'AF fine tune' for example.