Well the sure way is to ask the broker, but I wouldn't think so.
I think what you are saying is that there is a clause in the policy that excludes a initial period of time under the redundancy part of the insurance. But there are a host of other risks that you are covered for, for example, sickness that denies you salary meaning you would not be able to pay your mortgage? So the policy is valid and covering you - it is unfortunate that the circumstance outlined is just not covered.
Unless you are saying the policy was mis-sold because you were not told about the 'initial period'?