Chose the bank's insurance over ooba's for home loans

I am getting a home loan and I used ooba's bond originator services (which are awesome by the way). As part of the home loan you need to get insurance for your bond, ooba said they could give me a lower rate so I opted not to take the banks insurance and take theirs instead. But somehow in the process they've sold me an insurance policy that is more then twice how much the bank would have charged me. Also, from what I now understand if you take the bank's insurance your premium will go down as the bond goes down. This is just a friendly warning, don't opt for ooba's insurance for a home loan, they some how end up charging you more, it complicates the process with more documentation and is all in all not worth it.