No cash in store

The lady assisting me was not very helpful or polite. I went to the store to return shoes I had purchased and they were unable to assist me since it was a cash purchase and they had no money in store. No apology was given for the inconvenience and I was made to feel as if I was being unreasonable for expecting the shop to have petty cash in store. The lady assisting me called on someone else to come and assist me because I was refusing to understand that they simply did not have the money which I needed back urgently. I was told to return some other time. When I asked what would happen if I returned later and no cash sale had been made and they just shrugged. I need to go buy an alternative pair of shoes ASAP and now I have no way of doing that. Shouldn't the store has pretty cash? The refund was a measly R200 and yet I had to leave the shoes behind with the hope that a cash sale will be made and then I will be able to go buy other shoes. The manner in which I was treated was not very customer friendly or helpful at all.