Unfair treatment due to carelessness of the consultant

On Saturday 26th I went to JAM to buy some clothing, I bought mostly bras and tops . Upon reaching home some of the items were not suitable, I then went back to JAMS on Sunday to return and get fitting ones, the lady assisting me checked my returned clothes and instructed me to leave them with her including the receipt inside the plastic bag, I did as I was told, she insisted that I should fit the clothes so that I don't return them anymore. I spent close to an hour inside the shop making sure I take suitable staff, upon approaching the till to do exchange, the cashier realized that all my clothing was taken by another customer, I was kept waiting as they were searching everywhere until such time I told then to check their camera, they did so and after some time of waiting the other Lady Nonhlanhla apologized for the inconvenienced caused and requested me that they will call the customer in question and after talking-to her they will notify me first thing in the morning on Monday, I never got any call till about 17h39 on Monday when I realized that the shop is about to close, they told me they cant give me the clothes as they have to wait for the other customer to return them, I felt its not fair as I was not the one who was negligent and now I have to suffer since the other customer does not return, I told Nonhlanhla that today after work I will go to the store to get my refund, she phones just after 2pm saying that the customer has not come , I demand my refund and I can go to another JAM outlet, in feel I was inconvenienced. I am going there today to get my refund whether the customer brought back the staff or not.