2022 hybrid Corolla system malfunction

Hello. My vehicle recently stopped working (after I parked it without any errors). And after taking it to a Honda dealership ( covered under an extended warranty) they replaced the 12v battery ($320, f*** them). and didn’t fix the entire issue. Told me to take it to the Toyota dealership. They asked for diagnostics fee ($400) and now they’re telling me they found nothing and they want extra $400 for extra diagnostics for connectors. Should I go through with that?