Unfair claims handling

I have a been with miway for over 10 years now on personal cover. 2 years ago I moved my business insurance to them. Last month I had a minor business claim which was authorized but with additional excess due to kilometers that couldn't be validated on my side from third party log book. I am told the car travels about average of 20k kms per month while my actual review revealed 3k kms was traveled while estimation was around 8k kms per month. Stay away from this trick if you looking for business insurance.