Intentionally frustration by Innovation group

We logged the warranty claim with this company for the past 5 weeks and they have been intentionally dragging the claim saying they haven’t not received required documents which was a lie coz everyone that was cc on the mail received the documents. I have a prove from the dealer and from my side that the documents were received by other parties. I have learned today after I spoke with them yesterday that they cancelled the claim the reason for the cancellation was that Budget Insurance contract with Innovation group was ending on the 30th hence the dragging, back and forth. If you have any advice where can I lodge a complaint with them please assist.