N.H. Rev. Stat. Ann. § 479:8

Any mortgagee violating the provisions of RSA 479:7, or any mortgagee who after the satisfaction of the mortgage refuses to give a sufficient discharge of such mortgage, shall be liable for damages to the mortgagor at the rate of $200 for each week after the expiration of the 60 days up to a maximum of $2,500 or in an amount equal to the loss sustained as a result of the failure of the mortgagee to execute and deliver a release, whichever is greater, plus costs and reasonable attorney's fees.