Sleep King Karen Over charged for an item and ridiculed and called names by salesperson. Gulfport, Mississippi

I drove by the sleep king and noticed that they had a bean bag that was of my liking. I decided to purchase the bean bag. The bean bag was located on the outside of the establishment and priced at $49.99. I parked and walked into the mattress store and as soon as I entered a lady asked if she could help me with something. I replied to her I would like to purchase the bean bag outside. She said she didn't hear me, so I repeated myself and she said ill write you out a receipt for her register was broke down. I paid with my debit card and she gave me a hand written receipt. I loaded the bean bag in my car and drove home. Upon arrival I noticed the receipt said the bean bag was $55.00 instead of $49.99. I knew the store was almost closed so I decided to wait until the next day to ask why I was over charged for the item. The next day I called sleep king back, and asked for the sales women who was listed on my receipt. She acknowledged she was the women, and I asked her why I was over charged for the bean bag I purchased the day before. She said the price was wrong on the item because she never got a chance to change the price from the internet listing price. I told her I was under the impression that the bean bag costed $49.99 not $55.00 of which she charged me. I told her I thought this was wrong of her to do because the price differed on the item from what she charged me. I told he I just wanted to be charged the displayed asking price on the object. but she didn't agree. She spoke over me and never fully explained why there was a price difference. I pleaded with her to refund to me the amount I was originally suppose to pay for the item. After yelling and arguing with me, said she would refund me money, but not before she said "Ohh for heaven sakes. I them asked to speak with her manager, of which she said she was. I asked if I could speak with a corporate manager, she said there wasnt. Then I said I would just like my refund of being over charged. She said she would have to call her boss to see if it could be credited to my account. I gave her my phone number to see what would be done about my refund. On the 3rd day the same sales lady called me back and said I could pick up my refund because she couldn't credit it back to my account. I complied to pick up the refund. Upon arrival she yelled at me saying I was wrong and that she just forgot to change the prices. She said you understand, I said yes and she said no you don't. I said can I just have the refund, that you said I could pick up.She ridiculed, called me names and continued to yell at me. Then finally she gave me the refund and gave me a receipt to sign. She said just sign it, I said I would like to read what I was signing, so she again started to call me more names. I told her she was very unprofessional of acting like a manager, and told her I had been a good customer, but would not buy any of their products again. She said fine.I then took the money and receipt and drove away.