Re: Contact your credit card company.
Yesterday we returned a 4K dash cam under the SoGA. It only had a 4M sensor whereas true 4K requires an 8M sensor - the plastic lens was sh1t as well, leaving a picture of quality on a par with 1080P. It turns out a lot of 4K dash cams try to pull this trick! The 4K data file was not even interpolated up to a true 4K image size.
Once I pointed out these things, the company paid for the return of the good, gave me a full refund and an extra amount for my inconvenience. At least some companies act reasonably when they are caught!