Debbie cares full-time for her elderly mother, works part-time as a cleaner, and claims carer's allowance of £81.90 a week. But she was one of hundreds of thousands of carers to receive a demand from the Department for Work and Pensions to pay back large sums of money for inadvertently going slightly over the earnings limit. Now Debbie and carers like her are starting to fight back and demand change to the system