Grrr Bailiffs are all mostly complete pricks in my experience 
I'd say that aggressive tools are drawn to the perceived power of the job.
I had umpteen of them for ages after buying my house. The thick idiotic knobbers just couldn't seem to understand that MrX & MissY had done a flit. They left the previous owner owing lots of rent (which I had known about) and seemingly hadn't paid any other bills for years either 
The worst ones were the Council Tax ones who came back repeatedly for over a year, even though I was registered and paying my own council tax for a good while before they showed up.
Whilst pregnant with DS and ExP was working away one told me that my 'kid didn't deserve to be born into this' as he simply would not believe that I wasn't MissX. Twat.
I think it was the same one who put a note through the door to the effect that my neighbours car had been distraint levied or some such bollocks, all because it was parked in front of my house.
Tits the lot of them. I couldn't ever have a bailiff in my life in any way whatsoever. I'd run a mile if I was ever introduced to someone who works as a bailiff. I'm pretty open minded and take people as I find them, but for bailiffs I'd make an exception 
Charliefarlie - record them on a mobile if you have to speak to them again, film them if you want. I hope you can get it sorted soon. I don't have any advice other than that sorry. (Oh and never leave your doors unlocked/windows open etc while they are on your case.)