Nedbank Insurance absolute poor service

I am a multiple bond holder with Nedbank and my home insurance is with Nedbank Insurance. I have been struggling for months to get them to correct the address of one of my insured properties without any success despite various e-mails and providing all the proof they have requested including copies of the municipal accounts etc. I am seriously considering moving my bond to another bank because I have now had it. Poor service on something so simple and which one would have thought is in their interest as well!