This website:~
http://www.turn2us.org.uk/benefits_search.aspx
Will help you see wwhat you are entitled to.
You enter your details (anonymously) and will give you an approximate amount (and which benefit) you are entitled to.
Although the amount IS approx,at least it will show the benefits you can claim, and the sort of anount you should receive.
This page will aso find you an advi8ser in your area.Although it dioes list CAB & Job Centre(which you have already tried to no avail),if you click on the others you may find a Claimants Advice Service in your area.
http://advicefinder.turn2us.org.uk/