Unfair sales practice – Ramen Master Review

The kitchen upgrade cost 30,000 coins. Then after I bought the coins the price for the kitchen upgrade had “magically” increased to 60,000 coins. I wonder if there is a bug in the program? I had to buy twice as many coins as I had planned to in order to complete the upgrade, which benefited the developer of the app. I do not think this is a fair consumer sales practice.
Review by RamenBoy231 on Ramen Master.