Lots of internet tough guys here. But if they can show it truly is the difference in tax charged you likely owe it. There will most likely be a clause in your contract for covering the tax. Validate the claim, and if it is truly tax I wouldn't get into a battle. They can turn it in to your credit report and blown things up for 7 years.
If they can't validate the claim tell them to pound sand.
If they can't validate the claim tell them to pound sand.
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