Zara complaint: Poor customer service

Zara in Hannover downtown Germany refused to give me a refund without a receipt which never reached my email from their brand new self checkout machines. Even though I pressed yes for an email receipt, it never arrived which I didn’t notice until I tried to retrieve it. This was yesterday and when I went in today to return the jeans they were rude and snotty . I showed my bank statement and it showed I bought 65 euros, worth of clothing, the jeans were 40 and two items for my child. The supervisor said she actually believes I bought them but without a receipt there’s no proof. It’s like she’s saying well for all I know you could have stolen them! How disturbing, discourteous and unprofessional. All the clothing had large security tags on that needed to be removed with some magnetic machine and one associate was helping me because the newly installed machines were not working smoothly and another worker at the checkout station where my mother was checking out made her stop checking out and wait till he did something to the adjust the unit. So today the supervisor I spoke with said to ask chat online for Zara to send my receipt , so I did but I was told by the Ibot they could only do that if it was ordered online. I then went back and asked for a voucher or an exchange but again without a receipt it could have been stolen. I am offended by how she treated me as if I stole something even though I showed her my bank statement that we were there yesterday and obviously obviously bought it. It’s so rude. If this is the treatment one receives at Zara then I will never spend my money there again. In the USA where I am from, this would have been handled politely and without insult. And would have also been resolved amicably. The Germans lack customer service skills and their rudeness is inappropriate and unacceptable.