§ 39-a. Liability of lienor where lien has been declared void on account of wilful exaggeration. Where in any action or proceeding to enforce a mechanic's lien upon a private or public improvement the court shall have declared said lien to be void on account of wilful exaggeration the person filing such notice of lien shall be liable in damages to the owner or contractor. The damages which said owner or contractor shall be entitled to recover, shall include the amount of any premium for a bond given to obtain the discharge of the lien or the interest on any money deposited for the purpose of discharging the lien, reasonable attorney's fees for services in securing the discharge of the lien, and an amount equal to the difference by which the amount claimed to be due or to become due as stated in the notice of lien exceeded the amount actually due or to become due thereon.