The unfortunate reality is that crowdfunding is rife with everything from misrepresentations to outright fraud and the platforms don’t care. The platforms have an incentive to onboard as many campaigns as possible. There’s little you can do but post about it on the campaign’s discussion forum on Seedrs (phrasing it so as not to be an accusation, but a sincere question) and hope other prospective investors will read the information you share. Unfortunately, even if you post a compelling argument and it causes nobody else to invest, Seedrs will still work with the company to ensure their campaign reaches the target and can close – for example, Seedrs may extend the campaign or allow the founders to contribute to it. The only hope you really have is to convince individuals not to invest, and thus, save them from losing their money.
Essentially, once a campaign is created, the only realistic prospect of it being terminated is at the request of the company that created it.
You might find the following threads of interest: