He eventually had to get his son on the phone to say he wished to terminate the policy, with a recording clearly showing him struggling to articulate the words, let alone understand them.
Royal commissioner Kenneth Hayne QC said the call was particularly affecting.
"I think the community might have been particularly struck by the phone call where the agent insisted upon the son uttering the words 'I want to terminate the policy'.
"There's a particularly affecting record."
Senior counsel assisting the royal commission Rowena Orr QC recommended a number of misconduct findings against Freedom over its dealing with vulnerable consumers.
It included unconscionable conduct by selling insurance to Mr Stewart's son in circumstances where the sales agent knew or ought to have know that he did not understand what he was agreeing to.
Ms Orr said Freedom's conduct in the case also fell below community standards.
"Freedom failed to appropriately recognise and respond to the harm suffered by Mr Stewart's son."
She said that was demonstrated in a number of respects, including in the belittling tone of Freedom's internal communications about Mr Stewart and his son.
Ms Orr said the way Freedom generally handled cancellation requests also fell below community standards.
"Freedom employs extremely heavy-handed retention strategies which result in policyholders finding it very difficult to cancel policies that they no longer want or need," he said.
"The community would not expect that an insurance company would make it so difficult to cancel a policy in those circumstances."