Terrible Service - Their Assesors only Authorize Repairs on visible damages anything not visible you are on your own

I have had Miway insurance for over 6 years , a motorbike hit me towards the front on my drivers seat , Miway approved the claim , The assessor Henk gave me an estimation of repairs which was only structural damages -Repair Door- Repair bumber etc , i Questioned whether they where any mechanical faults detected on my car caused by the motorbike impact and he said he will request a Diagnosis which up to this day i am still waiting for , i picked up my car from repairs and it was making a loud noise on the engine and is shaking when driving , it struggled to brake , the alignment was off ,when i questioned the garage i was told they where only authorized to fix the driver s door and the front bumber all visible damages related to the accident nothing else and they did not even test drive the vehicle to check mechanically if everything was working - The garage tried to reclaim from Miway to fix the noise from the engine etc and the claim was declined and was told it was existing damages - How can i be hit in the front and there is a loud noise coming from the engine , the vehicle is not braking properly but yet its existing damages ?? - up till this day i have not received any feedback from the Assessor with the mechanical diagnosis that was supposed to be done initially on my car - What a *******