You are luckier than most when you said you never have an issue contacting them.

Those info you posted we have already tried, before I posted our experiences.
1) The 844 number does not have anyone to answer. Tried a few times different time of the day during working hours.
2) Have sent 3 emails to the same email address listed. None receive even an automatic reply. But each one would be followed by a junk email asking a "thumbs up" or "thumbs down" - i.e. if the issue is resolved. Duly filled out the junk survey, which never returns a response.
To add more insult, now receive another junk survey - would you recommend Doordash to your friends.
3) The ONLY responses ever received, were from the initial report on Doordash website under the order about Item being canceled by restaurant with no replacement. Therefore a refund is due. The response came rather promptly saying we have already credited you the Doordash Credit - that of course is NOT what we requested nor wanted. Hence we replied to that email, got a return response with a Ticket Number and a promise for hearing back within 24 hours. That was on Feb 12. We are now Feb 21. Not a single blip from Doordash on that initial response, not ANY response on the 3 emails sent to [email protected] - that indeed is the same email address the initial response came from.

In short, this company's customer service / support is a total failure in our eyes. They do not even have built in keywords reading in their "thumbs up", "thumbs down" junks. Most other companies when you put in Issue not solved, and some explanation in the comment section, the software would pick up such, and another follow up email would come with further instruction. We even have that happens with Bloomin's brands (Carrabba's and Bonefish) The GMs of the restaurants called us on 2 occasions when there were issues with the foods (undercooked, then way overcooked) / waiting stuff (pocketed a GC that still had good size balances), 2 years ago.

We do not expect Doordash would provide great customer service, but at least they should provide an adequate customer service when orders got canceled or wrong items delivered, things like that. They should issue Real Refund back to customer's payment card instead of issuing a Doordash Credit.

No retailer in this country would give you a store credit only when you return (in this case, never receive a shipment as an equivalent) when there is an order paid with CC or Cash and the incident is caught in time.

We give them 2 weeks time to do things right. Next week the time is up and we will file a partial dispute.

Essentially consumers need to take action to stop such practices which are akin to stealing.