Very bad customer service

I would like to report bad customer service that i receive at KwaMnyandu Ackermans and would like steps to be taken about it. Today I went there to get my 2 weeks old son sweaters and to my surprise I found 2 sweaters a blue and a red one. The red one had a tag written redtag R19 and a white written R39.90. And the blue one had the white tag written R29.90. When I went to the till the guy called siyah was a cashier. He scan the clothes and took cash. When I was about to exit the shop I checked the slip only to find that the sweaters were scanned at R39.90. I then went back to the cashier who than called a lady by the name of Hlengiwe and explained the situation as the tags were still there. Hlengiwe just took the clothes and rip the tags and gave me a refund. Mind you I didn't want a refund I wanted the.sweaters. she than said it was a mistake they have asked someone to change the tag but that someone didn't so she Can't give me the sweaters. I must state that she was very rude. I was so embarrassed because she was loud as the other customers in the que were watching us as she was doing her performance. I.than asked to speak to the manager she said in a very rude tone. " the manager just left and there is nothing she can do all I have to do is to take my money and go or else I must buy the sweaters at R39.00 each.