The legislation introducing the twelve-month time limit for some folk in receipt of contributions based ESA is working its way through Parliament still. The earliest it will take effect is April 2012. There could be a number of reasons for the ESA stopping, no current medical cerificate, failure to return the WCA questionnaire, failure to attend the WCA, it's been stopped to prompt you to make contact, it's a mistake etc. etc. The best thing to do is continue trying to contact the Benefit Centre paying the ESA, they'll be the ones who will know for sure, not us. If you can't get through, go to the Jobcentre and ask them to email the Benefit Centre and ask that they call you back within three hours.