Don't know what toll free numbers you used that went to Canada.
This is the US toll free number for TurboTax US support - 1-800-446-8848
Or -
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
Or -
Go to this website for TurboTax US Audit Support Center - https://support.turbotax.intuit.com/irs-notice/audit-support/
