It's not my fault

On Sunday morning I bought a white ****r from Old Khaki Rosebank, I tried on the shirt and as the store was so busy I rushed out to purchase and only noticed when i got home that there was a stain on the shirt. So I return it this morning only to be told that I need to come back later as they have no change! Why is that my problem and what kind of store opens with no float. The shirt cost R360 and now I must be inconvenienced by driving up and down because as usual someone can not do their job properly. You were very quick to sell me a stained shirt and accept my money and now the return is my problem. This is pathetic and my last purchase at this store!! Never again!