Bad customer service

On the 24th of December i went to ackermans at Apel complex ga-nkwana...I experienced a very bad customer service from the staff there I bought three basic tees which were marked 19.00 on to to find out that one long-sleeved tee was not 19.00 but it scanned 49.99 which was the original price...I went back to the cash desk after seeing my slip to enquire about the prices..when I get there the associates were not helpful at all instead they told me that they made a mistake by marking it down by 19.00 so the only thing they can do is give me a cash refund which I didn't want u wanted the tee and my 31.00 change...so a lady by the name of Malekoba gave me attitude and even made fun of me with other customers calling me names where by I was named crazy along with the customers...I was very upset I even told her that am going to report u she said it's fine go ahead ...if this is part of the ackermans culture then am never shopping there again....am also working for retail and good customer service is one the things we put first in order to keep our customers happy....