Many thanks for all your suggestions folks.
I have been at the office in Tortosa,i ask for Aprils bill,and was given last Aprils bill with an outstanding balance of 300 euros,i have never been asked for this all year,never missed a payment in 4 years here,never had a meter reading,or been asked to allow access for a meter reading.Need to move onto ombudsman bur cant till i get a reference number from Endesa,which they are unwilling to give.Basically there a nightmare to deal with,and will not accept they are in the wrong.Rant over and again thanks for your r :-/eplies.