Thank you for choosing TurboTax,
As per CRA, if there is a mistake in your T4A, you should contact the CRA. However, you should file your 2020 income tax and benefit return if you are waiting for the CRA to resolve an issue with the T4A you received. The CRA encourages everyone to file by the deadline. This will ensure there are no interruptions to benefit or credit payments and helps taxpayers avoid late-filing penalties.