Man shifted to Universal Credit in error by DWP

We were approached about a man who having been refused his ESA application his payments stopped and he was forced on to Universal Credit in error by the DWP.  He was appealing the ESA decision and was when it was in payment in receipt of Severe Disability Payments, so he was entitled to legacy benefits, rather than Universal Credit.  Our agents who are assisting him with his appeal phoned the DWP on his behalf to get this sorted out and the DWP immediately stopped his UC payments, and as it was part way through the month, any owing payment is then not made. This meant that he was completely out of money until his next PIP payment, due to be paid next week.  In the meantime he has no credit on his energy meters or any food in his flat.  We agreed to send him £50 to keep him going until his payment next Tuesday.