You may report violations of the Can Spam Act at [
reportfraud.ftc.gov].
If the person emails from gmail or outlook, each of those services has rules about spam and you can send a violation there. If the mail shows up as a private domain (name of a company), go to [
lookup.icann.org] type in the domain name. They will provide you with the address of the service company (ie. godaddy.com) where you can forward your complaint that their web server is being used to send spam.
Who knows. If a few shoppers decide they want to be treated respectfully, a number of MSCs may just start doing that. And by the way, the MSCs need to follow the law regardless of whether you are a stellar shopper, just stated shopping, or are not the best shopper. Don't accept the "if you were a good shopper, you wouldn't have to put up with ...." It's a bit like, "if you weren't dressed like that, you...." Respect, being treated properly is NOT something someone should have to earn or prove themselves deserving.
You may have noticed that the moving industry, telemarketing industry and a few others receive a lot of focus from the FTC. Targeted industries have additional requirements, specific paperwork and review from multiple Federal Agencies including the IRS. Some industries that were once incredibly bad, have had the bad players removed, and the remaining businesses have cleared up their act. Remarkably, they find their profits have improved as they are perceived as more trustworthy. The FTC performs undercover investigations and reviews complaints as they go through their reviews to determine if there are systemic violations of things such as spam, fraud, tax violations, improper classification of employees as contractors, false advertising, wage & hour violations, reporting and more. It's unfortunate that the more ethical businesses in the same industry suffer the additional scrutiny, are investigated and sometimes have their reputation suffer.
If the more reputable MSCs worked to ensure everyone followed the laws and were ethical and told the common MSC platforms that they would not share a platform with disreputable businesses, and MSC business associations had a standard of ethics and removed bad players, they would able to work with better shoppers, and be received better when they go to businesses to sell their services.
MSCs are paid by businesses that want feedback on customer service. It is ironic that the reputation of the MSC industry is so poor. It must be so difficult to continually attract new, untested shoppers, screen them, train them, meet client deadlines and generate new business from clients that often feel the need to wash their hands after hearing from a MSC.