Very Poor Service MiWay

Good day, I am having issues with MiWay. At the begining of the year I put a claim for a leak in my granny flat, where water was leaking throug the walls. They sent out a leak dector to check if there was any pipes that was leaking and they advised me that they can not find any pipes leaking and they can't undestand why and from where the leak is from. They declined my claim on poor maintaince. I accepted it and decided last month to fic it on my own. I got a contrator to come and sort it out for me. When digging at the wall where the leak is going down about 2 meters we find that the storm water pipe that is running through my yard is leaking and the water was getting through my house and causing damages. Mi Way sent out their service provider to assess the damages and they decided to pay for the wall inside of my house. Damages to my kitchen sink cubboards and stove cubboards they dont want to repair saying why did i remove them. Hello if I did not how would i have to repair the wall. Also the assessor advised me that he will ask MiWay to send out a engineer to check the retaining wall and they noe say they won't send. Phetetic service in the highest from MiWay. I asked to speak to a manager and no one calls me back. I need someone to hear me out. I hope someone senior calls me to sort this out. They have all the photos and reports of thye damages. Very easy to take my money but to claim is a issue.