Slow to no response

Quite disappointed in the service received by TransUnion. They are quick to sell a product but slow to rectify their mistakes or at least give feedback on it. I lodged a dispute in December; it was closed without any feedback. Lodged a second query in March on the same issue. When I phone to get an update I am simply told that it takes 20 days to resolve the query. Yes, I know it take 20 days to provide feedback but, we are 3/4 through and still no means to get feedback on the status of the query. Due to their inability to correct the record I am unable to buy a vehicle with a credit score of 702. Extremely frustrating. At this stage I think the query will just be closed again, with no explanation.