Jets Return Policy Issue

On the 30th of November I purchased a baby daiper bag from Jet Stores in Somerset West together with some other items. I went to another store and saw a better deal so I purchased another one. I did not have time to return to Jet again and thought I will return it another day. So today less then 3 days later I went to Jet Promenade Mall and attempted to return the bag. The sales lady refused and noted that it is their policy to return items on their gift card. Now this doesn't make sense as the items have not been used and only been in my possession for 1 day. I was counting on my cash refund to do something else with it. Can someone from Jet Store please explain their return policy!