Does Incredible Connection have a refund policy?

I bought a printer on Saturday the 9th of November, the printer was a demo on the shop. It was very slow. The Sales Rep advised that I can return the product if I am not satisfied. The receipt says returns have been extended from 7 days to 14 days. 3 days later I was told there is an exception to the refund and returns if ink has been put on the printer. The technician advised that they would deduct 15% from the refund as I had put ink on the printer. The manager said once the printer has ink its a loss for them. I spoke to customer service and was advised that the product had been opened from the box. I advised that the product was a demo and she said her manager says they cannot override the decision of the manager at the store. The receipt should state that once you put ink on the printer then there would be no refund , how one must know the quality of the printer without putting ink on it someone must show us..