Shocking Experience and Responses From Owner

The owners interactions with potential clients is shocking. When subscribing to their newsletter you receive a "welcome" voucher which doesn't work when placing an order at all! This is why I contacted them, with my very big order ready in the checkout cart, and got told by the owner that I am rude for expecting a response (from multiple contact channels) after waiting hours on end! Not one apology for having to wait 18 hours for a response, no instead I get told that I must be patient and I am being rude! Not once was I rude other than calling her out on her bad attitude towards a potential client, which she then deemed rude! Not worth supporting at all. They only have good reviews on their facebook page, because the owner blocks clients that will potentially give negative feedback and delete negative comments.