Yesterday at Symonds Hungry lion the service was really bad, the staff was rude and moody they didn't want to redeem vouchers

Yesterday at Symonds Hungry lion the service was really bad, the staff was rude and moody they didn't want to redeem vouchers. I waited a lot of hours at the till point while they were busy with other customers and there's this new cashier Ngco... she didn't even want to try redeeming my coupons. My last order was a triple big boss meal I added 2 chicken fingers I paid R20 cash for them and I don't get the Dippa sauces and if I check prices if u add fingers u only pay R10. I wish Hungry lion can have their own online store where we can order and pay peacefully cause yesterday I got angry since no cashier was interested in assisting me, they have this tendency of undermining people who buy with vouchers and on busy days before they used to lie and say the system is offline yesterday I waited more than 30 Min at the till point they were helping cash/card payments only everyone behind me was helped.