Breach of written agreement

I have purchased 3 GWM Steeds. Two of them from Haval Edenvale. I have had a problem with the tyre sensor that has now been replaced 3 times. I was told that they are waiting for parts and I will be contacted. Four months later I emailed them to be told they will not accept liability. I have decided to take action and I am looking for others with similar experience. Please contact me only if you have a GWM or a Haval. And only had a problem with Haval Edenvale. Kevin ***