Property Management Company Cancelling Contract

[Brendan Moore]

I recently changed insurance companies for one of my properties. When I sent this information to my PM, I was told they now require $1,000,000 liability insurance on both of my properties. I would have to piggy back another policy on top of my current $300,000 policy which would cost me. I was never notified of this change and now they can't manage for me unless I change my liability insurance. My contract with them says 30 days cancellation notice but since I never signed for this new change in the contract and/or was never notified.  What is theirs and my obligation to the current contract? Any information will be appreciated? 

Thanks