Short answer: No legitimate independent editing company can guarantee acceptance in a third-party journal. Editors can improve language, presentation, formatting, and submission readiness, but journal editors and peer reviewers make the publication decision.
A strong manuscript can still be rejected for scope, novelty, methodology, editorial priority, reviewer concerns, or limited journal capacity. Those factors are outside an editing provider’s control.
Treat guaranteed acceptance, guaranteed peer review, or guaranteed publication dates as warning signs unless the provider is itself the publisher making a clearly defined editorial offer—which is a different relationship.
A responsible service should describe controllable deliverables rather than promise an outcome controlled by another organization.