Rob K:
As nice as this all sounds, it’ll never stand up as it’s your word against theirs.
It’s not, it’s a judgement about the truthfulness of an ad.
If I was running my own agency I could think of no end of ‘excuses’ to put a lid on any ASA investigation. If the ASA asked you to prove existence of the job you’re advertising for, it’s not exactly difficult to create some paperwork to support that.
True to an extent, although such an agency would now be running the risk of a much more serious deception charge. It depends on how thorough the ASA is; the ultimate proof of a job is to see a person doing it. Don’t forget the end client has no interest in helping an agency lie.
Furthermore, if the ASA says “x said he signed up last week in response to your ad for ‘drivers urgently required for new contract’ but no-one has contacted him since, why?”, it’s quite easy to quosh that one by dreaming up any number of plausible reasons such as he doesn’t have the 2 years experience for insurance cover; the client requires previous experience of x vehicle combination which he doesn’t have; we tried to call him but there was no answer; we offered him work in the past but he didn’t turn up for the job; he was rude to our client on his last job for us, etc etc etc.
The ASA are highly unlikely to get involved in personal matters between the agency and the driver, and assuming the reasons given are plausible (which all the above examples are) it will be “case closed”.
This would never happen. They are a standards agency, not a court or tribunal. They are not there to adjudicate between two parties. Anyone can make a complaint about any ad, you don’t have to have had a connection with the agency, or even be a truck driver.
Do it if it makes you feel better, but I’ll guarantee you 100% that it won’t make any difference whatsoever. 
Put that statement in an ad and I’m sure the ASA would 'ave ya. The road to misery is paved with apathy. Here’s something I’ve discovered; 80% of things we try don’t work. But here’s the thing; the 20% of things that do work make our lives better, and we don’t get to that 20% unless we try the 100% of things.
So folks, if you see agency ad that’s a pack of lies, tell the ASA. Coz it’s free and you don’t know til you try. And if you don’t, it will DEFINITELY carry on.