Home loan payments with additional principal

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Has anyone heard that if you make a mortgage payment and you pay more than the amount due stating that the extra amount be applied to principal and your mortgage company does not apply it that way then your loan and interest and everything about your loan is all messed up? Well someone told me that if that happens the mortgage may be liable to pay off your mortgage, has anyone else heard this? I am about to sell my house so if anyone knows if there is any truth to this please let me know. Thanks