I had a sort of similar issue not long after I had the charger installed. If I went into the app and changed anything, 99% of the time, the car would not start charging as scheduled and i'd have to power cycle the EO Mini 2. But, thankfully, at some point it started behaving itself. EO will generally lean towards blaming the wifi connection (which is BS in my case) but there you go.
I'm currently awaiting a call back from their techs regarding a "high priority" issue of electricity arcing when I plug in my charger, and have been quoted 7-10 days so unfortunately you may be right about not holding your breath.
Frankly there's not a lot you can do I don't think. As others have said, do the maths yourself and schedule the charge via the car, or, wait for EO to fix what definitely does sound like a charger fault.