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Do you live in a State that requires a building permit? If so your best course of action would be to talk to the building inspector. Many States also have a mechanical inspector. They should pick up on the shoddy workmanship and require that it is fixed before they pass the rough inspection.
Yes it's a code violation but only if your locale enforces the Uniform Mechanical Code. Flex duct cannot be compressed or distorted.
Give me a few to check if the IRC includes ductworks standards.
What State are you in?
IRC M1601.2...factory made air ducts shall be installed in accordance with the manufacturer's installation instructions.
You'd first need to determine what brand flex they used then just Google the name. There's usually a lot of info including install instructions on manufacturer's websites
But all manufacturer's specifically state that their flex cannot be crushed or distorted.
Do you have any more questions?