Refusal to give my money back on my debit card

I went to purchase an ink cartridge at Game. Because they keep the cartridges locked away, their system now is to first pay for the cartridge at the till, then come and collect it from the employee. I did this, but was then told by the employee they were OUT OF STOCK of the cartridge I'd just purchased and paid for. And now needed to go to customer service, stand in a queue and wait to get my refund. NOT only did this waste my time and leave me without the ink cartridge I needed - but the customer service lady told me she could not refund my money to my debit card, and told me I had to take cash!! Apparently they could only refund on a credit card. <br> SHOCKING SERVICE! and I left there with 30 minutes wasted time, cash I didn't want and no ink cartridge! Thanks GAME