Please tell me that you're trolling. Please. This is one of the most asinine complaints I've ever heard for a digital distribution system. You're acting like they deliberately read your mind and had the sale a day later than you wanted it just to 'rip you off'. You're not going to get your refund, because your refund is neither necessary nor deserved.
If you had paid attention to the sales, you'd realise that they have a daily set of deals and a larger set of deals running the whole sale, and you would also have realised that if you bought it in the larger set of deals you wouldn't save as much money as in the smaller set, so this sort of thing is inevitable. Financially, you'd have a really hard time convincing a developer or publisher to have such a huge discount for the entire sale period.
If you had paid attention to the sales, you'd realise that they have a daily set of deals and a larger set of deals running the whole sale, and you would also have realised that if you bought it in the larger set of deals you wouldn't save as much money as in the smaller set, so this sort of thing is inevitable. Financially, you'd have a really hard time convincing a developer or publisher to have such a huge discount for the entire sale period.