Unsatisfactory customer service

I went the to exchange the pants I bought for my child who is in boarding school in august using my TFG account and the pants were still in the same condition I bought them with the tag on I also had the receipt. I explained the reason I couldn't return them on time is because the child was far and the receipt was left with me since I asked someone to deliver the clothes to her. The cashier called David Kgiba who didn't even lift a finger to assist me he just told me he can't assist he explained the process of which I understood but asked in this situation what do we do and he told me he can't do anything meaning I just lost R300 just like that. I told him I will leave the pants in the store as there is nothing I will do with them and he told me I should do as I see fit. Then i left the pants and went. I am very disappointed with the service of TFG such a huge brand with poor service to their loyal customers.