refuse to pay out a valid claim

My car has a claim against it for the repair of the gear box.

Innovation group during the claim asked my to why there was oil under my motor which i explained it was a oil leak from a previous crank seal whihc was repair, i further more provided pictures, then they said it is fine.

The day after they told me that they need the invoice for the repair, whihc i provided and said it is fine.

The 3rd day they where up and down, looking for reasons not to pay out costing me time as i have not been with a car for 3 weeks.

then they said they have to check the amount of my toatl claims to what the car is worth, and other issues.

It took them for ever and they looked for any excuses not to pay out the cliam.

Now they are saying that this claim is related to a previous claim as i previously did my duo mass fly wheel a few months back, but after the duo mass fly wheel the car was checked twice to see if all is fine with the clutch and gear box was fine.

A few month later (Now) my gear box stated making a slight noice so i sent it in, and it was confirmed that the clutch does not need to be done but they reomened it being doen for the age of the car and while the gear box is open.

They have look for every way not to pay out and they are still refusing to pay out under the gear box policy as i will be fully cover, they are saying it is related to a previously claim. i am getting no where and very irritated.