Support Package Upgrade - Regional Pricing

Hi,
I bought the game on Steam. I got the game price according to my country through Regional Pricing, but when I want to upgrade, the in-game pricing is not Regional, so when I want to upgrade the supporter pack, I have to pay the full game price again. Can you help me find a solution for this? I don't have the option to refund the game, after all, I played for 11 hours.

As far as I'm aware all local prices were switched to a monetary parity model instead of a purchase power parity model. If the prices are in your local currency then they would likely be correct.

You can, of course, repost your question on the help and information forum, but if I can give you a suggestion it would be to reveal what region you're referencing when you do so, that way they can more correctly answer your question.