From the Terms of Use:
"2.1.2. Us.We may terminate or suspend your account if we determine, in our sole discretion, that:
(a) you have violated any part of this Agreement;
(c) doing so would be in the best interests of our community, the Riot Services, or the rights of a third party."
and
"If your account is terminated, you’ll no longer have access to it, including any of the associated data or content (e.g., champions, skins, Riot Points, etc.). You’ll not be entitled to any refunds and we’ll have no liability to you... You understand and agree that using the Riot Services comes with the risk that your account may be terminated or suspended and that, whenever you use the Riot Services, you’ll bear this risk in mind and always conduct yourself appropriately."
and
"YOU ACKNOWLEDGE AND AGREE THAT YOU SHALL HAVE NO OWNERSHIP OR OTHER PROPERTY INTEREST IN YOUR ACCOUNT..."
and finally
"You must also comply with certain additional rules that govern your use of the Riot Services (the “Code of Conduct”). The Code of Conduct is not meant to be exhaustive, and we reserve the right to modify it at any time, as well as take appropriate disciplinary measures including account termination and deletion to protect the integrity and spirit of the Riot Services, regardless of whether a specific behavior is listed in the policy as inappropriate..."
Sounds like someone should learn a valuable lesson on reading the terms for any purchase agreement they make. Let this be an expensive lesson to you to not enter into agreements or purchase services whose rules with which you are unable or unwilling to abide.