What discount?

I bought this app because there was a 40% or 50% discount offer (pop up ad) from the related alarm clock app. While both apps seem ok, I definitely got charged the full price for Weather app which was offered at a discount. I would not have purchased this Weather app had it not been for the discount offer. What will you do for me now? Offer me a discount and dont deliver! Based on ethics I rate your weather app 1 star ?.

Saskatoonie about Weather Live, v1.9