This is the response I finally got from TurboTax.
Navigate to this URL:
https://turbotax.intuit.ca/ty23/eula/tto
Look for section B, SUB SECTION 2
I paid my outstanding balance with the CRA and wrote them a letter explaining the situation and asking for relief on the interest charge.
Unfortunately, they said to pay it and wait for a response. I don't expect a response for at least 6 months.
I think that TurboTax should be responsible to refund the interest if the CRA refuses to do so.
They need to take responsibility for their error and simplify the process for getting a refund.
