No verified evidence exists of a third-party service reversing a hardware ID (HWID) ban or cheating-related permanent ban.
Generally, these services split their offers into two categories: 1. Support Ticket Appeals (Social Engineering)
Riot Games itself has issued formal warnings about these services. In an official statement, the company declared that “such ‘unban’ operations not only fail to lift account penalties, but once discovered, they will actually increase the severity of the punishment.” The statement strongly urged players not to trust such claims.
Technical services that provide software to "spoof" or change your computer’s hardware identifiers, allowing you to play on a new account despite a hardware ban. The Common Reasons for Bans