Refund system sucks

We bought 3 throws of R189.99 each. Diluent to tfd fact that my hubby only had R365 credit, we paid the rest of the balance which was R204, 97 in cash. At home we realized that we only needed 2 for the purpose. We returned the one and was only refunded R189.99. Our question was, what zbout the R14.97. They refused to pay it back. We tried calling their call centre,but no luck after trying to explain. The consultant was not in a good mood and her customer service was very unprofessional. R14 might seem little, but what if hundreds of people are experiencing the same...with how much monies will Pep get away with?