Very unpleasant

I went to mcdonalds in farrarmere corner of great north and murcury street waited in long queue in drive thru while i was waiting checked on app what i wanted decided i wanted to redeem the mcfeast reg meal with mcflurry @R95 expire date 31/12/2021 was told that i cant redeem for some reason after scaning bar code i must take something else i got mad told her to just leave it and i left and never planning to support mcdonalds again this is unacceptable very unhappy fyi the contact number on google doesnt work also