Not giving small change to numerous clients

On Saturday, the 4th of April 2015, I ordered a meal through the Fourways branch drive through. On reaching the 2nd window to make payment, the cashier stated she had no small change (.50c). The gentleman in the vehicle also had a similar problem as he had paid for a meal with a R200 note and only received a R100 note back. I requested to speak to the manager whom she went to call. As their was a queue of vehicles behind me, I preceded to the collection window where I requested to speak to the manager again and was told that the manager was in the office. I asked the employee to get the manager. She requested another staff member to call the manager. Once again, the queue had moved up to behind my vehicle. I couldn't hold the queue up so went and parked in the car park. I then contacted the call centre to lodge a complaint. I explained my story, gave my details and the call centre agent was going to contact the store and then contact me back. This still hasn't happened??