Rejection of my claim

I had an an accident on the 17th of July 2017 , reported my claim on the 18th of July 2017. I have provided all the information that they required. My claim has been rejected on the bases that my tyres were not roadworthy. The accident was not caused by the tyres but I was trying to avoid a car that was car behind me in a very high speed and when I swayved I then lost control of the car. Had I not swayved that car was going to hit me behind and probably would have even lost my life which surely Absa wanted to happen by the way they treated my claim. The investigator even questioned me whether I was sure if the accident happened where I'm saying it happened. What is that??? What does it mean ???my matter was prejudged and they are just shifting the blame to not honour my claim. I am so disappointed. I have been their client for the past 3years and have never defaulted on my installments ever. I feel what they doing is unfair and I just want justice and for them to honour my claim.