Poor car not happy at all.

First of all I bought new RXE Dci diesel in 2015. After 5 yrs of run and 75599 kms running I started getting problem of car pulling towards left. I can't leave steering for a second. I mean after adequate handling and time to time Renault service at every 10000 km it's very sad to tell that this much huge car and heavy built I m surprised by the poor suspension. Now Renault is not able to diagnose the problem.