Poor service

On 24 September I bought sunglassses at ackermans mall of the south... On the morning of 25th September I opened them for my daughter and the lense fell off... I returned them to the store at about 4.20pm after work... I spoke to a lady at the door who referred me to someone else who read me the terms and conditions of returning accessories. While I understand that, I do believe that if something has a fault I should be able to return it terms or not... The lady then referred me to a gentleman who continued to question me as if to verify the reliability of my story... He said that he would exchange them for me but I told him that... I had seen a few that were faulty on the rack and therefore I'm sceptical of taking another pair as clearly the quality was not good... He then sent one of his staff members to fetch the remaining stock... And there was a pair that also had a piece missing... He refused to refund me and I left the glasses at the store... As a loyal ackermans customer, I believe that I was treated unfairly because I didn't return the glasses because I didn't like them... I did so because they were faulty and I'm allowed to feel uncomfortable buying another pair because of poor quality....i am truly disappointed that although the glasses were only R69... I have lost it because of policy that does not cater for your own faulty goods...