You need to talk to the LHS and work with them. Take physical measurements of your foot then compare this to the scan data AND the additional comments / info the LHS sent to True. If this all correlates then the LHS need to ask True why the boot differs from the info supplied. Work out how much longer / shorter the boot should be, where it needs to be narrower / deeper, cut differently etc etc. I have seen cases where True have misinterpreted the LHS supplied data and made the boot wrong. Mistakes happen, it's a fact of life.
And I'll say it again - Both at the scan / measuring stage and at the boot fitting stage, it's really important to have a fitter who knows his stuff. This will reduce the chance of errors when they are made and to recognise that the boot isn't right at fitting time and to provide the assistance you need to get it fixed. 6 months down the track and they are still tinkering with the boot to try and get it to work, that isn't a good recommendation of the LHS imho.