It doesn’t work that way. The minute a customer says you didn’t deliver an order that you really did, it goes against you and can get you banned.
If you don’t prove they are lying, your job may end. Everything you said in this post is meaningless.
The food delivery service knows and admits there is such a thing as customer fraud.
It will typically not stop doing business with a delivery driver of long standing generally known to be honest if after the investigation of a claimed delivery failure it’s looking at a he said-she said situation.
Drivers need to keep it to a minimum when interacting with the representative of the delivery service. Don’t complain, don’t explain.