Disgusting treatment from Manager and team

Terrible Management, after exchanging a item that was gifted on Christmas to my daughter and them saying I could exchange, after going to counter to exchange was told I could not and had to get the slip from the person who gifted the item.. Really... Even though item had tag on. I've been a loyal customer for years spending a lot of money and to be treated like this is beyond disgusting and now they lose a loyal customer.