Mocked by paramedics and then discovered a life changing diagnosis made and was never told

Location: Washington State.

Hello my dad is a medical mystery with his life, recently he was taken by ambulance from one hospital to another due to severe, gastrointestinal issues, during this ride he told us he was mocked by the paramedics and told he was faking it. at his arrival to the hospital he was put in emergency surgery due to a perforated bowel, the surgeon told us that if we were even an hour late he would've died.

Fast forward, we then find out a couple days later that for a year now he has been diagnosed with Congestive Heart Failure, and nobody had told him or referred him to a cardiologist, he found this out when a doctor asked about his CHF and we were confused. the CHF explains the fact that recently he had a blood clot and swelling on his leg that never really subsided even with blood thinners.

My curiosity is if there's anything we can do about either situation? We are asking for ambulance transport records to possibly file a complaint but I wanted to come here and see if there's anything else to think of.

Thank you in advance!