Mo Ali,
Welcome to the real world. If you had sold something and the person to whom you sold it didn't bother to turn up to collect it or even indicate that they would not until afterwards - would you feel that you owed them a refund?
Maybe you can sue them with one of the many 'win or no fee' agencies that are making life for everyone in UK difficult and expensive. Try being more considerate in future - it might also save you money.