Why is customer service giving out incorrect information?

On November 28, before committing to a purchase, I spoke with a customer service representative to explain that I wanted to purchase a license as a gift for my son for Christmas (Case Number ADB-42804696-P4N6). They advised me that I could do this and that I would need to provide the invoice/confirmation to my son for him to switch the product to his account. Total cost to me at that time was 78.99CAD as it was on sale (total, with tax - $89.26).

My son attempted to add the product to his account this week and was unable to. I contacted customer service again (Case Number ADB-43302342-H8X6), and this time, I was told that it was not possible to transfer the product, that I could be refunded and would have to repurchase the license. I asked if I would get the discounted price and was told I should be able to on the site. This seemed like a reasonable way to resolve the issue, so I accepted the refund.

However, the discounted price was not available to me on the site. I had to pay the full cost at 130.99 (including tax, $148.02), using his account.

I spoke again with an agent today who told me that i cannot get a partial refund. I'd have to refund the entire thing - and then what? Not buy it until it's on sale again? This is completely unacceptable. It is making enjoyment of this product challenging for my son.

I simply want Adobe to provide a refund for the difference between these two amounts (58.76 including the tax). I bought the product in November in good faith based on the conversation I had with the representative and assumed it could be transferred, and again yesterday, assuming I would get the discounted price. To have a third representative tell me that you can't refund a partial amount is ridiculous.