A/C blows cold then hot?

We bought the vehicle listed above EV off of Carvana with about 2,000 miles on it. After a few months, the A/C started doing a thing where it would blow cold air for a bit then switch to blowing heat. Obv not ideal.

We took it to a trusted mechanic who said a sensor was malfunctioning and making the car think it had frozen, so it would blow heat to fix the issue. I took it to a dealership (because it should be covered under warranty) and they only put more freon in it. Got it back and a couple days later the A/C stopped working entirely. They took it to a different dealership, and they said there's a hole in the compressor and it won't cover it under warranty. I don't believe this is the case and would like your opinion on what the issue may be and what to do. Thank you!

Thank you!