I work at Tucows Domains/Hover and we're digging in on what happened here. I've reached out to the OP already via email. tl;dr our support team didn't handle this well at all and we've already issued a full refund.

We are still looking into where the price mismatch found its way into the picture, but that domain is a tiered price domain but it is also "legacy" priced meaning it should renew at something very close to the standard price for a renewal but didn't.

For anyone reading the thread, they did do this! Had a nice call with James too, which I appreciate.

It looks like the situation is actually more complex and interesting than "The registry rug-pulled me". My .sexy domain price was increased by the owners of .sexy (to $3000) since I bought it 6 years ago BUT in Hover's system it was supposed to retain the legacy price of $38 as it had for the past few years. Something went wrong between Hover and the registry where the legacy price wasn't honoured and as such, it bumped to $3000 on renewal. Apparently support really flubbed this one and we both agreed that going the "post on HN" route for customer service isn't exactly a win on their part.

The money has been refunded and I've been assured they're looking into the bug. Will probably do a follow up blog post!