Thank you for requested me on this question.
You can only bring action if they have discriminated against you because of sex, race, colour, age, religion etc. Just because they have not behaved very well and indeed may be incompetent I am sorry to say does not mean you could sue them for anything other than we have previous discussed.
So as long as it was not on the grounds above, you can not take action against them I am sorry to say.
I know this is not the answer you want and certainly not the one I want to give, but I do have a duty to be honest with you.