Have you telt the ESA section that the CA has ended? It does take time for changes in circumstances to be actioned and if there are arrears payable they can be made by a separate payment. If I were you, I'd 'phone the ESA section and ask if they are aware that the CA has ended and if no, see if they will accept a faxed copy of the letter you have recently received. You may be able to get the local Jobcentre to fax it for you or you could see if they will take a copy of it and they can send it through their internal courier service to the ESA section.