HEY SCOTTTY! This Porsche dealerships service department is lying to me and i have it all on tape!

Former mechanic here. Didn’t last long because of carpal tunnel. Anyways, i replaced a alternator coolant fitting that was leaking and it’s low down on the engine so i had to drain most of the coolant out. I didn’t feel comfortable purging the system myself and it only accepted a little bit of coolant so i had my wife schedule the procedure at the local dealership. It was towed in on a flatbed in front of their service department but it needed to be jumped every time because it took 20 days ago to get serviced. The service lady must’ve got tired of jumping it so she left it running outside in the 90 degree heat for what she said was “ 5 minutes or so” and it developed a new leak i hadn’t noticed before. Another guy told me he was there when she started it up when he was there and it was “dumping coolant”. So we’ve got 2 different stories already. I have recorded the audio of this and all the interactions i have to this point. Long story short it developed some new codes while it was there and on the 6th visit after denying they had cameras and/or footage they finally agreed to get me the footage that would exonerate them if it got screwed up. Correct me if I’m wrong but the vehicle may not even register that it’s overheating if there is no coolant on the coolant temperature sensor. I still don’t have the footage yet and yes i know I’m dumb for buying a used Porsche. Btw it’s an 06 cayenne turbo so it’s aluminum block and head. What should i do?