Refund for hotel booking.

I booked a hotel with entertainer gateways. Money was deducted from my credit card. Upon realising that I paid more than I thought because I used the wrong currency I cancelled the booking. The app clearly stated if I cancel before 8pm I will get a full refund. I cancelled at 7:22pm and no refund as yet. I contacted them and now they telling me I cancelled at 9:22pm which was after 8 pm. Why are they lying really. Is this how they ***** from us?