Refuse to honour warranty

My delonghi Magnifica Start has broken down twice under it's 2 year warranty. Delonghi are refusing to cover the repair as they say the warranty label behind the water tank has been removed. I was never notified of this label and have no recollection of it being moved. I was told that it would never come off itself by Sershan. I have taken impeccable care of the machine and kept my proof of purchase. But Delonghi refuse to even consider to help, even though my warranty period isn't over. Delonghi had the chance to make right, but chose not to. I will not be purchasing Delonghi products going forward