Terrible Customer Service and Experience @ Nandos Pavilion Mall

So today I placed an order online for collection at the Nandos at the Pavilion shopping center. When I went to collect, I advised the cashier that I have 4 x R50 vouchers that I would like to redeem. She had redeemed these vouchers on the terminal however the amount didn't deducted from my overall total. She then advised that the vouchers are not valid and I need to pay the amount due. I requested to speak with the Manager (Hlengiwe) who checked and told me that these vouchers are redeemed which is why it hasn't deducted. I told Hlengiwe that it's obviously been redeemed as the cashier as just remeemed them. She then asked me to wait while she called someone. I waited at the store for almost an hour and requested to speak with the Regional Manager as this was terrible customer service. I was then told that the vouchers have not been redeemed however their branch has problem redeeming these vouchers. I spent almost an hour and 30 minutes at the store and was still not given my meal. Hlengiwe is one of the most rudest and unhelpful managers I have ever met. She has no understanding of the word customer service. I cancelled my order and went to the Nandos in the Westville Mall and placed an order. I paid using 3 x Voucher. The Manager at Westville Mall ****to) was very helpful and advised me that one of my vouchers have already been redeemed. I then paid the difference with cash and left the store with my meal.

Nandos has ****** me of my R50 which is unacceptable. In my profession, I deal with angry customers every day and know how they should be treated, the way I was treated by Hlengiwe was not right and this needs to be dealt with.

I hope Senior Management at Nandos read this as I expect a response back.

Regards Dissatisfied Customer