I just wanted to renew not buy the product again

I'm not at all happy that all I was trying to do was to renew my subscription to Norton Internet Security For Mac and instead of just bringing me to a renewal screen your "renew" menu brought me to the product purchase screen.  I tried everything I could to just renew but was unable.  Now I bought the product twice and don't think I should pay the same price to renew as I did to originally purchase the product.  I'm hoping something can be done about this and I sure hope I don't have any further problems having my other Mac "renew" with this same key.