Cannot serve at Drive-Thru

My friends and I tried to purchase two separate meals at the Drive-Thru at the KFC in Duduza Rank, Tsakane. We were told we could not make two seperate orders just because we were at the drive thru. I've done this before at different KFC outlets and do not understand why I couldn't do it here. The manager, Alice gave us a bad attitude and did not even care to listen to us. To make matters matters worse, our orders were not complete. We ordered 2 streetwise 3's and in one pack, we only received two pieces of chicken, plus the chips were stale. I cannot and will not accept such service as a paying customer.