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FTB may not levy your bank account just because you paid the mortgage interest...
I feel there are some additional facts missing here.
Most likely - they "think" that you are a resident of California - and there some facts which made them to believe so...
If you previously was a resident of California and your residency has been changed - you would need to provide evidence of your new residency.
But if there are some ties to California - for instance if you keep your CA driver's license - it woudl be harder to proof.
I woudl appreciate if you provide additional information regarding you prior and current residency and evidences you may provide to support your position.