Service Slow and no chips placed in our in order

Yesterday after 14h25 after returning from Houtbay Harbour we went to the KFC drive-thru in the main road and ordered 6 piece family treat with 3 sides and a dairy milk krusher. When we got to the drive-thru we ordered by the machine,went to pay and had to wait for our food . What bothered me was the employee at the counter of the drive- thru had to take orders, take payments and place/give us our food, which i think was unacceptable. The Employee was busy with us, taking other customers orders and preparing our food at the only 1 counter for the drive thru. Eventually we received our order drove away from the KFC on route to Campsbay checked our order and noticed that the 2 large chips was not included. My husband decided not to turn back, but i thought if the one employee did not have to do 3 peoples work this would not have happened. I could see the employees was overwhelmed basically having to do 3 things at one time. If there had been someone else serving/giving us our food and taking our payments we would have had our 2 large chips in our order.