Forged signature

Bought a Nissan qashqai 1.6 visia 2013 model from solo motors a year ago problems al the way till just now when my petrol pump and steering rack gave problems car is stiil under warranty so wanted to get it fixed under warranty had request the service book that I've been waiting on just to find out the car was neva service before they delivered it and that my signature was forged on the dekra report tbat i neva got and saw since a got the car