Why am I being charges DOUBLE for services that are in both deluxe and premier when you choose to up grade to the next level??????

I chose to up grade from deluxe to premier to get more coverage for my self. I do not understand why I am being charged for both the deluxe package and the premier package. I see this as being charged for two different packages when I only chose one. When being asked to up grade this was never explained that I would be charged for both. If I knew I would be charged for both I would have never chosen to up grade my package. I WILL NOT use turbo tax again unless you cancel the charge for the deluxe package to where I do not have to pay for it. I will also tell all my friends, family and co workers what has happened and erg them NOT TO USE turbo tax.