Store manager has a bad attitude

On 26 September I bought myself a set of earphones at said store. After two days, the right earbud stopped working. Today I went to return the item, as per the store's returns policy as can be found on their website. After being helped by two ladies who were very eager to do their duty, I was confronted by the store manager who refused to authorise a replacement after implying that he has no way to confirm that I'm telling the truth about the product that I have purchased (which was after the ladies mentioned previously both confirmed, after inspection, that my product was defective). He was extremely dismissive, arrogant and condescending towards myself and a fellow customer who had exactly the same problem as I. I am considering not visiting this store in the future, especially of this is the type of person that they appoint as manager...