Bad service from management

On Saturday the 9th of November I've purchased AK picture to the value of 179 I discovered that the chair was a reject because it got the wripping on the edge of the seat and I took it back on Sunday the 10 the manager who assisted me that night was very helpful friendly and he went out of his way to try to sort me out unfortunately I did not have my receipts and the manager told me that he will gladly assist me on Monday the 11 I went back with the receipt and a manager Amini was the oppersite of Sundays manager he asked me why I used the chair first before bringing in so I explained to him I was already at home and I brought it on Sunday but forgot the slip a person could see that he tried to manipulate me the cause I look like a kid against him although I am a old man a man of 46 clearly one can see that he doesn't have customer relation etiquettes he even ask me where do I live and why do I traveled so far just to come and change the chair which I've used already so I explained to him I was in the area and it doesn't concern him where I am where do I go to, the thing is the chair is faulty and you must replace it or refund me