Bad service coupled with incomplete order

We went over to Burger King in Alberton New Market drive through - upon arrival we placed an order for 6Burgers 2 @ 55=110 plus two 100 mix match meals ! The First Lady was rude over the phone even though we emphasized that we wanted 6 Burgers our order still came out wrong . Our burgers had onions even though we’d asked that we shouldn’t have any . No our problem is that having been billed 220 we only received 4 burgers & although it’s our fault that we neglected to check until we got home it’s your staffs duty to make sure that orders are sorted . We’re rather dissatisfied in the service we got & this is the first time I’ve ever received such service from you guys .