In an effort to get something fair in terms of compensation because of a very unpleasant situation caused by Delta (I described this here: Refund from Delta for canceled trip, but that's not of prime importance to know the details) I asked both to booking customer service and to a Delta help desk at the airport how to proceed and they told me to contact "Delta corporate customer care" (in both cases they provided me with a telephone number and told me to find out email address on the website). I was able to find a form on the Delta website that seems to be adequate for my request (and I used it explaining the details of my experience) but I wasn't able to find again and confirm the telephone number I was given. I'd really like to be able to speak to someone even if I am not optimistic about them giving me additional benefit as compensation but reaching them via that telephone number they gave doesn't seem to be a good way to do that: I stayed on the line 4 hours on a Saturday morning and 8 hours on a Friday morning, always in queue. There's something weird in this because that means multiple people were waiting that terrible amount of time, too.
The telephone number I'm calling is +1 8004552720. Is there any other telephone number that I can use to actually get an answer from the appropriate department? I'm aware that for some companies one can take advantage of foreign customer services of the same company that are less busy, but I don't know if that holds for Delta.