Sorry but sounds like you messed up. You need to inform insurance companies of the smallest detail. They are notorious for trying to not pay out. I've had a no payout on a car due to the fact I had changed an air filter on my car.
I wrote the car off and because I didn't inform them of the change I lost out on my car being replaced.
One thing I've learned is keep the insurance up to date with everything,no matter how small of a change. it will save you loads of trouble in the long run.