Esa and pip suspended

Hi all
Just wanted to share this with other members to see if anyone else has had the same experience. My esa and pip have been suspended after several calls to dwp eventually found out that a letter that had been sent to me by dwp had been returned as address unknown , when I asked what the alleged letter was about I was told it was just to advise me of the esa rates changing from April , I clearly remember getting this letter so can't understand why they would say it was returned. , the suspension of my benefits has caused all sorts of problems inc bank charges , unpaid direct debits etc I called again today to dwp who have now re enstated my esa / pip but will take a further 3 working days to get to my bank . How can this happen? And has anyone else had similar problems. ?
Monsterman