Take him out once a day some where quiet before feeding him, walk him on the lead for a while... then let him off try to recall 4-5 times if he does this give him lots of praise then take him striaght home & feed him, in doing this will encourage the dog that when he listens & does what he is told not only does he get praise he gets fed aswell.
try it no promise's but it works for me everytime & not only with recall pretty much any training i wish to teach the dog...
I have just brought a Bull/Whippet bitch shes 16weeks i use the same method.
hope it works for you mate, be patie