Simply because users try to get information out of you in order to determine whether or not you were charged correctly does not make them Verizon employees. Verizon employees are clearly labeled as such.
In your earlier thread which can be seen here, you were asked several times what the address of the store was so that it could be determined if you made your purchase at a Verizon Corporate Store. You failed to reveal the address, yet stated more than once that it was a Verizon Corporate Store, not a 3rd party. You are now saying you made the purchase at a Premium Retailer. A Premium Retailer IS NOT a Verizon Corporate Store, but simply a 3rd party retailer. They are unable to charge the upgrade fee at the point of sale and it was correctly added to your next bill. A Verizon employee even stated as much, to which you again replied that the purchase was made at a Verizon Corporate Store.
It is not a Premium Retailer's mistake, they are unable to charge the upgrade fee at the point of sale. It MUST be added to your next bill.