Bad customer service.

<p>I had bought a block of 250g unsalted butter from checkers. Get home and it has green mouldy lines all over it. I take it back and spot one of the managers(I presume because she's wearing a white shirt and staring around) and explain to her that I need to return this item. She takes it and walks behind the counter. Hands me a book for me to put my details in. Has a small chat with the cashier and then hands me my money. I then ask her if she's going to open and check the butter because she didn't seem too interested. So she does and pretends to be shocked. So I'm left standing there and eventually ask if that's all? Is it wrong of me to be expecting an apology? Or is it my fault that the butter clearly has something wrong with it and I'm just being a nuisance by bringing this to your attention. One last thing, is it standard practice for them to throw away your receipt after you give it to them? I purchased other items as well but now have no proof of it because she chucked it in the bin right in front of me. (P.S incident happened 18/02/17. I tried uploading this then but it just wouldn't go though) </p>