STEPAWAY FROM RENAULT

How is it possible that a timing chain - one of the most expensive items in the engine - can only last R23 000kms. These things are supposed to last up to 90 000. Of course it is out of the guarantee period and Renault Tableview are not particularly interested. I have been so disappointed in my Renault Sandero - things keep going wrong - the parts just don't last. I will never buy another Renault.