Customers of the American freight business being acquired by WiseTech Global for $3.2 billion have asked the competition regulator to unwind the deal, concerned that the ASX-listed software giant will be too dominant.

WiseTech, chaired by controversial billionaire businessman Richard White, said it would acquire e2open in May, adding its Expedient software to its CargoWise product. Both platforms are used by companies that ship goods around the world to create documents needed for customs officials.