If you're saying it shows $150 in the service order within the app, that's just an automatic estimate that shows up when they enter it into the system. It's not necessarily what they will charge. All of my warranty issues (including repairs of repairs of repairs, of repairs) showed a price in the app but in the end I was not charged.inquired with the SC, and they are now billing me $150 as diagnose fee.
Normally you can message them to ask for confirmation, but good luck getting someone from that particular SC to reply. Sorry about your experience overall. I've still got a couple of outstanding issues they've screwed up again and again, and I'm so exhausted with Tesla I'm thinking of paying a third party to fix those once and for all.