Incredible Connection refusing to take back a faulty product

On the 5th of May I bought chat headphones at the Incredible Connection branch at Westgate. These Logitech headphones are faulty as I am not able to use them for my meetings. I returned the faulty product aboout 10 days later, unfortunately I had thrown away the packaging and the product carries 2 year warranty. I explained my issue to the disengaged store manager who did not even bother to come and talk to me, I had one of the employees who kept going up and down between the two of us. He refused to even exchange the product of which I was just going to leave him with the packaging of the one that he would have exchanged and he refused. I will never buy anything from Incredible Connection and I will make sure that my friends do the same the customer service from the store manager was so atrocious. I am now left with a default product, where are my rights as a customer.