buyer doesn't want to pay escrow for taxes and Insurance

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I have a buyer that has an escrow account set up with Evergreen note servicing. It has been a real pain getting the account set up. Now the buyers are trying to just send in their P&I payment. I Have an underlining loan that escrows so I have to escrow my buyers taxes and insurance as well.  What recourse do I have if the buyer refuses to pay the escrow portion?