Kia Hatfield Not resolving my query

I bought my car from Kia Hatfield 2 years ago. My service book is incomplete prior to me purchasing the vehicle. I have been querying with them numerous times and still no feedback received from them.

Further to this i took my car in at their dealership for service in May 2022 and found that my engine splash cover under my car is missing. They claim that they put all parts back of which i am certain they removed and did not replace. I am really dissatisfied with their service.