Horrible customer service

I placed an order on the kfc app on 14 sept, upon looking for the Menlyn mall branch, the app was hanging and all I could see was the phone number. Subsequently I chose the store as the number matched with the number on Menlyn Mall website so I chose it as this is where I work. When the confirmation sms came through It stipulates that it is the branch in Charles street, to which I have no access. I contacted kfc and they said that I would receive a voucher via sms, which never came. On 20 sept I decided to give them a call, to which the consultant with the surname of mpendo I think, responded that it’s not KFC’s problem I I made a mistake, yet it’s the info I got from the KFC app. I asked to have my voucher transferred to where I actually am situated as was given attitude and advised to call the store myself to arrange with the store manager! I have been trying to call ‭***‬ for days now with no response! This is the most pathetic service ever received! I work in retail and I’m appalled