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I am Loren, a licensed attorney for over 30 yrs. Thank you for your patience as I review the question. I will post my response shortly.
A notary does not make a document any more enforceable. It merely affirms the identity of the person signing it.
So, unless the contract specifically requires the notarization, you can send an plain letter of cancellation, signed by you and not notarized and it is a "written" notice, by legal definition.
Just make sure to use the method of transmission required in the contract, if any, for giving notices between the parties.
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