Meg
If an Assessment process was started, then you can reasonably expect a new Decision on your claim to be made, although this won't necessarily place you in the Support Group.
Payments will still cease on 30/04, however. if you are placed in the Support Group, then your ESA(CB) will be re-instated and you will receive any back payments due. If you are placed in the WRAG then you will only be eligible for NI Credits if you cannot receive ESA(IR).
Unless a Decision has been made, you cannot make an appeal as there is nothing for you to appeal against.
I'm not aware of any legislation that would cover a re-claim of IVB, however, without knowledge of your appeal and why this statement was made, I cannot categorically state that this would not be the case.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems