permanent suspension; permanent ban
Used especially for online accounts, services, or memberships that are permanently deactivated or banned, often as a penalty. The term is a metaphorical extension of 凍結 (freezing) with 永久 (permanent).
See also: 凍結
My account was permanently suspended for violating the terms of service.
Users who have been permanently banned can never use the service again.
凍結 means 'freezing' or 'suspension' (often temporary), while 永久凍結 specifies a permanent, irreversible suspension or ban.
アカウント停止 is a general term for account suspension, which may be temporary; 永久凍結 explicitly means permanent.
Compound of 永久 (permanent) and 凍結 (freezing, suspension). The metaphorical use of 凍結 for account suspension is common in Japanese internet terminology.