McDonald's

1 cashier who had a complaining customer & was asked to call a manager, the manager then deferred the line stating, “We don’t take orders here you need to use the touch pad” I placed my order not really knowing how to use the machine and used my app for my $1 fries and meal but when prompted to pay I wasn’t able to navigate and now there was a line for the cashier who is now taking orders, so after waiting 10 minutes we attempted again while I waited for help but now the machine said we already used the coupon. We left very upset.