bad customer service

it was Saturday on the 03 Nov i was returning the shoes that I bought in Oct at woolworths in Pine town, I brought the slip the last return date on the slip was Dec, because it was month end i took the shoes that i wanted to exchange with, then i went to join the long queue, the cashier Samke asked me whether i have won the shoes, and I said yes i have won it and take it off because it was small and uncomfortable, she said no you cant return the shoes because it has to be in a salable condition, and she called a supervisor a tall coloured lady( no name tag) she came and said no we cannot take the shoes back, she asked the cashier to go in the shoes dept and ask the supervisor there if I can be able to return the shoes, and I said it is the first time to have such problem, I use to return shoes in a very bad condition but i never had problem, and another cashier who was assisted customer said yes maybe it was factory fault, that s why we took it back, mind you the shop was full and the customers we looking at me as if im being difficult, after 05 min the cashier came back with the same shoes that I was returning she said she was told to come with this shoes to show me different between the new shoes and the shoes that have been worn, and I asked her what must I do with the rejected shoes, she said may you can sell them, I asked to who, and she said she doesn't know, I felt so disappointed and embarrassed with the service I received, Yesterday on the 06 Nov I went to Woolworth in west street, they were very friendly, they greeted me with a smile, there were no question asked, they only asked for my woolworth card or my ID book, I check in my bag I find out that i forgot to bring my Id and my card, but they continue to assist, they asked me is it fine if they give me the gift card and I said yes, I want action to be taken against pine town staff for not doing their job.