I don't know which hospital it is. The one on Soi 3 did video the procedure my husband had done ( just a hernia). If it is the same hospital, video evidence shld be available. I asume videos are done for a reason.
Nobody knows the background of the story. There are situations where people piss the other party off. Israelis aren't known for being polite & respectful. Talking from experience.
A Thai doctor once told me not to bother with local insurers as they will always wriggle out of their responsibility. I'm with Axa UK which many don't like but so far I had no issue. All done through a local broker.