Extremely rude staff

Went into the branch next to Oxford circus station to return a dress with the labels on and with a receipt. Not very nice e memembers off staff made me feel so embarrassed the way they embarrassed me. I did not understand the refund process and thought they would tell my options as they put refund on to a gift that I know longer have. When I asked if I could just do a transfer as I had the receipt they said know call customer service. They then said if I didn't know I should have asked bit how would I know to ask anything its job job to explain. During this embarrassing experience another member of staff I do not her name but recognised what was happening and nicely try to help as she could see how embarrassed I was. She was so very nice I then said to the two other why couldn't you have explained and been nice your colleague. And too insult me even further when I walk away from the till o then heard her laughing about it. I explained that I worked in customer service and would not speak to my customer like that. Plea if you have cctv in that store please check the time was about 12.45 pm on Friday the 9th. When I asked there names they were very reluctant to give it to me the lady with the long dark hair refused and said I've done nothing wrong.