OP, Cuebill is right.
Collies need jobs - not "2 walks on the lead a day", but JOBS, where their brains & bodies are engaged, active and constantly being used.
Think about it - a collie is smart, he learns to figure things out. He may housetrain easily, learn basic obedience easily, but what else can he learn?
BC?s learn to open doors, steal laundry, and climb a tree. If they have nothing better to do they entertain themselves by doing something like digging or barking. My own youngster (who is coming up to 6 months, lives on a working farm and is being trained for a job) is a complete nightmare - he's currently howling in the kitchen because DH has put him there after a long day running around the farm with our other 2 collies. He's probably covered the best part of 10 miles today, running with the others and doing "stuff". I've just heard a bang and now he's chasing his (empty) food bowl across the floor. He's been in 5 minutes, he's had his dinner and he's already bored.
BC?s are like that super-smart nerdy kid in Chemistry class - he successfully completes the class experiment - and then blows up the lab because he wants to see how the chemicals interact! Super smart kids make super big messes.
Collies are inherently nosey and inquisitive. If they hear something exciting going on elsewhere, then they may try see if they can be involved somehow. They just wants to join in. It has nothing to do with them being ?untrained? ? my own can are working farmdogs who are highly trained. It is all to do with the fact that they are incredibly nosey, they always wants to be involved and 'working', and they don?t want to be left out.
Regarding the recall, always have something that makes you more attractive than anything else. Food is a good motivator. Also, start crating him at night again.
Cuebill has given good advice, as has Dooin. If you're really stuffed and struggling, I suggest you contact Wiccaweys Here although the advice you have been given is a very good start.
As for food - get him on to dried food, so that you can use his food allowance in reward based training. "Good" ones are hypoallergenic and additive free - CSJ, Skinners, Burns, Wainrights, Gellert Hypoallergenic, James Wellbeloved.