The most frequent—and expensive—mistakes are hidden endorsements, misleading price/“sale” claims, non-compliant email/SMS consents, and sloppy contests/sweepstakes. Add recurring-billing problems (unclear free trials, hard-to-cancel “negative options”) and you have a recipe for complaints and enforcement. Fix the basics: disclose plainly, substantiate claims, capture/ honor channel-specific consent, and publish complete promotion rules with records to prove it.

Compliance earns loyalty when your marketing is truthful, transparent, and respectful of customer choices. Clear disclosures (especially for testimonials and pricing), honoring consent across channels (email/SMS/calls), and fast takedowns of mistakes reduce complaints and build confidence. Treat promises like SLAs: publish them, measure them, and fix misses quickly. Over time, customers reward brands that say what they do and prove it, with higher retention and referrals.