Adobe charging more than what its estimates before creating the video!

Hi

I was trying to render few images using Topaz…firefly first charged me 80 credits and then it went up to 400 credits, no fixed amount for generations

Some time its charging more than estimated cost. Its like going to a supermarket and buying items but the final pricing will be decided and my change at the checkout!

Where can I find how much I have been charged for each generation
 

I am seeing lesser credits in my account I don't have a record of the lost credits where can i verify that?