Whether someone is intentionally spamming or not, if they want to keep the registrar happy and stop getting complaints, they remove the email address of the complainant from the database if they receive a complaint. Unless there's a sufficiently large body of spam reports to automatically take action against the account of the alleged spammer - which may have happened after the OP's complaint - that's actually the best way to resolve the problem. 99.9999% of mailing list owners and blatant spammers alike are in it for the money rather than trolling complainants

I'm really struggling to see how GoDaddy could have a policy that fixes the issue of a person complaining about unwanted emails without disclosing the email of the person who doesn't want to receive the email any more.