Refusal claim repairs on my vehicle

I'm currently driving a Land rover Discovery 4.The vehicle was diagnosed with the entertainment amplifier faulty. Going forward the dealership load a claim to Innovation group because I have an insurance policy with them for the situations like this one. The dealership battled to get authorisation to do the repairs for about two weeks,until I get involved and find out what was the issue from innovation. I was assisted by very arrogant staff from Innovation who tend to argue with me that the failed part is not covered under the policy which was completely a lie. When i realised that I'm talking to the *********** person that have no clue about the electronics I took this issue further. After I have done that I got couple of phone calls from innovation instructing me that I must take my car to the dealership for the full repairs.During that time they never mentioned that they are going to pay only R3000.00 for the part replacement even though they were fully aware when the dealership gave them a quote as to how much is going to cost. Today they are refusing to pay for the full amount.The media must be aware for this kind of practise from Innovation group.