Bad Service at Clicks Atlasville

I went to Clicks Atlasville in Boksburg this morning to return three electric hot water bottles (Safeway)that were suboptimal in heating. I purchased a similar product from Dischem (Elektra) that performed much better. I spoke to Maggie Mosehla. She asked for my original till slip. I did not keep the original, because it is printed on thermal paper that fades, but rather I scanned the slips onto my phone. It has my club card number on it, so Clicks can even see my details. She refused to give me a refund, because she said that the auditors won't accept the electronic copy, even though, with the club card number, the store can reprint the slip, as she says they suspect their staff of *****, and "I should know better". I was prepared to sign an affidavit with my name and contact details, but Maggie said that was not good enough. However, she passed me off to Xolani, who was polite, and processed the (nameless) gift card for me. I fail to understand how a clever staff member, whom the company clearly does not trust from Maggie's comments, would be unable to figure out the same "scheme" and use a gift card, which is as good as money, but just forces you to buy something else from Clicks. When I told her that I would put in a complaint, she told me that it was fine, I could do so. I found her manner offensive and rude. Even if the company insists on this policy, she could have handled it in a much better way. By the way, the back of the slip says that you should be able to produce the tax invoice OR the original till slip.