Nedbank insurance

I have banked with Nedbank for 7 years and I have my home insurance with the bank for about 5 years now. In the last 3 months, Nedbank has cancelled my insurance THREE times without my consent. The first two times, they apologized and said it was a system error and it will not happen again. Yet, yesterday they cancelled my insurance again without my consent! I am wasting money and time calling them numerous times for their system errors. Something that is not my fault, yet I need to spend time rectifying their mistakes.