Disgusting service at Zara Cresta

Yesterday 22/10/19 I bought a blazer at Zara cresta.i sent someone to go and purchase it with my credit card for me and he is not sure whether he dropped the slip in the shop when he was trying to put it in the packet or on his way when he was walking to the car.when I got the blazer I immediately realized it was too big for me and the next day ,today I took it to the shop.

I was then told that I wouldn’t get a refund and they had no server locally and it was only in Spain to reprint the slip.i asked if that can’t be traced with my card number or item code and they said no.Surely they have cameras in the shop to check all that and I still I can’t be helped.i bought the jacket for 1200 now I am told I should just take it like that as oversized as it is-meaning I have just lost 1200 and no one can help.I asked them what to do then in this situation where it is oversized and was the last one in the shop.1200 is a lot of money for me to just forget and move on honestly.i really I find that unfair.How does someone still want to shop there after bad customer service?