Took my perfectly working 2020 MacBook Pro to the Apple Store last week for a battery replacement—quoted $249+ tax. They sent it to their service center, then said it wouldn’t power on, blaming a logic board failure, and upped it to $698+ tax. It worked fine at drop-off.

I've tried my best escalating but to no avail. I got it back unrepaired yesterday and it is completely dead now. It worked before Apple touched it, I don't know what to do, posting this from my phone.

Has anyone dealt with this? Any ideas on how to get it back to working condition again?