Did you try calling HPI ? We had a similar issue on a car my wife owned and HPI helpfully removed the flag on their system when we explained the circumstances (a dealer had input a rounded-up mileage I had provided into a valuation system - so my own fault really)
Edit: probably of more relevance to Simon than for OP where there is a more obvious and long-standing issue, but worth a try?
Last edited by twotribes; 22/08/20 08:42 PM.