It’s theft of service, which is definitely not identical to theft of property but I think the analogy is useful because more people understand that a business screwing up doesn’t mean you get their products for free - it means you go somewhere else.

It especially doesn’t mean you have any expectation not to be treated poorly by that business the way you would if you’d complied with your side of the legal agreement. If you’d paid and the business failed to track that payment properly, you’d be getting serious compensation because there would be a legal contract they weren’t honoring.