A: Initially, you should review your order. Remember, only basic transition and progressive lenses are covered under the Enhanced Program. Also, be aware that billing at Walmart is not done on an a la cart basis, as it is done with other carriers. If you still believe there is an error in your billing, contact NVA at (800) 672-7723. As always, please feel free to contact GEBA at (301) 688-7912 or (800) 826-1126 to assist you with any questions you may have.