NO RECEIPT, NO REFUND AT GAME

I bought a Bennet Read Tough 15 vacuum cleaner on 31 May 2015. It has since broken 3 times and replaced twice with brand new ones.<br> <br> Today I returned the vacuum cleaner to Game N1 City with the exact same problem. I returned it in its original box complete with all accessories. When I checked the box, I realised that I either lost or misplaced the cash slip. I then asked the customer service desk to print a copy or proof of purchase as my details was recorded on their system as they made a copy of my receipt when I booked in the vacuum cleaner for the initial repair/assessment. Game then said that they cannot give me a refund unless I have the receipt. My response was that surely they must have my receipt nr on record as a repair nr was issued against it. They then said they cant see it on their system.<br> <br> They said that their system does not show my receipt or invoice nr, only the date that it was purchased and therefore they cannot refund me. I spend more than an hour in the store and they did not call their manager to assist me. I then left the vacuum cleaner just there at customer service. Bought a brand new one(other brand) and left the store.<br> <br> How do I get my money back?