sorry bud looks like you will need a new caliper bud sorry.........
the handbrake lever goes into a small rubber boot at the rear of the caliper if you remove that boot you will see the mechanism that the lever works, this in turn works the piston thats used for your footbrake into your hand brake,now to reset this mechanism you wind back the piston fully and then pump the pedal out which should reset this mechanism and give you a good handbrake but if any of these parts are seized,faulty or worn your handbrake will never be right