Nedbank Home InsuranceCall Centre...... Nightmare service

I have a home loan with Nedbank which is up to date. I have a geyser not working since 1 June, and reported it to Nedbank Insurance; but they are not efficiently assisting me. over R500 spent calling their call centre, they drop calls on me, promise to call back and for two months, a simple repairing of an insured geyser is still not done. I have begged on the phone, I have cried, I have reasoned........No joy.