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It appears that you are missing both step flashing (between the roof and the wall) and the head flashing (above the trim running parallel to the roof line). Here is the link to the Hardie Best Practices manual with specs on both flashings: https://www.jameshardiepros.com/getattachment/9a1017e1-853d-4574-b3e9-7afb1a5a472d/intro-tools-hz5-us-en.pdf.
Then how are you handling this problem? They are ofcourse fraud and justice needs to be done. I think you must reach out to the Home Quality Remodeling contractors online for the professional advice on this. They are licensed and very professional. So, they can solve your problem easily by giving you the best solution possible.
Everything the rest said above but, in regards to the warranty:
Check with your Secretary of State and see how long they have been in business. If they are giving you a 10 year warranty, but have only been around for 6 months, then who cares? They won't be around long enough for you to have a warranty issue.
On the other hand, if the one around for 2 years has been around for 10 years, then they probably know that no one calls them for legitimate warranty issues 10 years later, and simply cuts it short so that they aren't called back to fix work that they didn't do.
Call a professional certified roofer who can do a full inspection and report of how to proceed. Professional roofers can bring insite and cost savings others might not. They have years of experience and a trained eye to make sure all problems with a roof are discovered and remedied! Remember - When hail hits an asphalt shingle it often knocks off the protective granule coating. Once the granules are gone, the protective layer underneath is exposed to the elements. Always call a professional roofer!
If actual damage has occurred to the roof, due to hail, there is really no other way to fix the damage, except replacing the roof system.
Depending on the type of roof that you have, if the damage is minor, you might be able to complete a spot repair, but that also depends on the condition of the roof. Hail typically falls randomly over the entire roof, so when there is damage, it tends to be all over. If your roof is older, it might not be in repairable condition, or your roofing material might have been discontinued and have no match available for sale.
I suggest having a Haag Engineering certified roof inspector or a structural engineer evaluate the roof and tell you if you have another option.
The best move would be to simply make sure the existing vapor barrier product is installed properly (flush to ceiling below) and add blown insulation over top to to get the best R value and at the least expense.
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