Register a complaint with the creditcard company with proof of last years $38, the auto renew message with price of $38 and the amount they put on your card. Pretty clear and cut? You can’t offer X and then take Y. It’s Hovers problem what the price behind the door is.

Did you read the ToS? The ToS states they renew at prices mentioned on the website. I can find .xyz to renew at $19.99. Now get your screenshots and get your money back. (I’ll correct myself transparantly: this is not very clear from the ToS. Prices are in USD and from time to time they can limit the number of domains at that price. That says little about the price at renewal.)

> It’s Hovers problem what the price behind the door is.

This feels key to me. If .sexy is changing fees with very short notice, and Hover doesn't have enough time to inform their customers before renewal, then Hover should stop offering .sexy domain names. None of that is a problem for the customer.

What does .xyz TLD have to do with this? The TLD is .sexy