A B2B website should help a buyer explain you internally. Name the services, who they are for, and what happens after an enquiry. Avoid a homepage that could belong to any firm in the category.
Service pages do more work than a slogan. So does a clear way to contact the right desk. Proof can wait until a client is willing to be named. A vague claim is worse than a plain description.
Write the pages in the language sales already uses. The site should not invent a second company.