101 Plus Okey Wrongly Charged 250 TL Instead of 49.99 TL for In-App Purchase

In the 101 Plus Okey game, I purchased an add-on that was displayed on the App Store at a discounted price of ₺49.99, but instead I was charged nearly ₺250. This is completely misleading and unfair, and it is not the first time I have encountered such an issue with this game, which makes it even more frustrating. My user ID is 738*372, and the purchase was made in Istanbul. I could not find any proper option within the app or App Store to request a refund or support, leaving me without a solution. I demand a refund of the wrongly charged amount and expect preventive measures to be taken so that other players do not face the same problem in the future.