If a mortgagee, or personal representatives, successors in interest or assigns of the mortgagee, after full performance of the condition of the mortgage, whether before or after a breach, for 10 days after being so requested in writing, and after tender of the reasonable charges, neglects or refuses to discharge the mortgage, or to execute and acknowledge a certificate of discharge or release of the mortgage, the mortgagee is liable to the mortgagor, the heirs, successors in interest, representatives or assigns of the mortgagor, in the sum of $300 damages, and also for all damages occasioned by the neglect or refusal.