I need an refund – Vietnamese Dictionary Dict Box Review

I made an in app purchase and paid 19.99 for the one time payment, but after one month the app turned back to a free version with tremendous adds and asked me to upgrade to premium version again. I still don’t figure out how to contact apple or the developer to ask for my money back. It likes an act of robbery, users, be aware before you intend to buy
Review by Lincoln Tran on Vietnamese Dictionary Dict Box.