I am the Pro who will be providing you information today
I suggest you need to begin your Appeal process with the Bergan County Tax Assessment Office - Please see this link
If that does not work for you then you can appeal to the Court system
In addition I suggest you might want to use this link
and review the information on appeal the tax bill
I suggest you could use an appraiser to give you a value on the home. But the appraiser cannot represent you You can bring the appraiser as a witness
Once you review the second link and the information on tax appeals and assessments, you will be able to determine if your Tax Bill is fair or not and then proceed from there
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Thank You and good luck with everything