worst service ever

l have never seen such kind of practice in my life , l made an online order upon on the 12/09/18 l realized that l have selected a medium instead of a small size on the 13/09/ l went on the chat as per below chat //// (06:19:26 AM) *** Lucky joined the chat *** (06:19:44 AM) Lucky : Hi Talent, Have you paid for your order? (06:22:13 AM) Lucky : Are you there? (06:22:52 AM) talent: yes am here its paid already (06:23:35 AM) talent: ********** 36678 (06:23:41 AM) Lucky : Please be advised that you need to exchange the size once you receive your order as we are unable to edit an order that has been placed already. (06:24:01 AM) talent: ok (06:24:10 AM) Lucky : Is there anything else I can help you with? (06:24:18 AM) talent: in shop or sending it to you (06:24:27 AM) Lucky : in shop. (06:24:33 AM) talent: ok (06:24:42 AM) Lucky : Thank you for using our online service enjoy your day :-) (06:24:48 AM) *** Lucky left the chat *** which l understood and hoped that l will swap it in store /// go in the store and to my surprise l was now being asked to pay an extra amount for the order l had paid for already . which got me to ask why and the manager Gift Sikweza simply said because the bar codes are difference and the item is the seem l had to pay, which l asked him am not buying a bar code am simply swapping from a medium to a small this guy gave me an option to either pay the difference or he will give me my money back which left me with no option but to get my money back .l have a credit account with this company and it has now left me asking my self why do l even do business with such a company as we speak am in the process of paying the amount due and close my account because how can you be asked to pay for something you have paid for already just because of a mere fact of exchanging a like to like item.