Unfairly treatment

We have been advised by the assessor that our policy is cancelled and we received this information last night at 20:31, we are not happy with the outcome. According to the miway consultants the policy is still active. We are so confused as we dont know what to do. We cannot get the car insured with other insurers due to the outcome of dishonesty. We still owe the finance house and now we stuck as we can't get insured. What to we do then till the dispute department investigates the matter?