That's ridiculous! Surely they can't hold you responsible for any discrepancies or shortcomings?!
As long as you have copies of the checks you can prove that you have paid the rent it's not your problem?
Good luck.
It just gets worse, and personally I can't see any sign of it getting better. There's a whole generation who are not going to get on the property ladder until half way through their lives. Quite sad.
I've given up on the idea of the UK property market improving. It's going to get to a point where people can't afford to buy anywhere until they are into their 40's. Not good.