Pizza Hut's AI system caused 'cascading' problems and $100M in damages, franchisee alleges in new suit
(www.businessinsider.com)
In some cases DD will refuse to cancel it, or makes it so complicated that the customer has to go through their bank instead for it. So it could be cases where the customer attempted it and was told to screw off, so therefore they just went through their bank for a chargeback instead.
DD would still attempt delivery on those orders, and then likely try to protest the chargeback as well saying the service was "eventually" rendered as food quality is on the food place and DD is just the transport.