Kijiji does not have a method for deleting your account completely. You could attempt to threaten them under GDPR (which is a European regulation), since many have tried to be compliant to keep themselves out of hot water. Details on 'Right to erasure': https://gdpr-info.eu/art-17-gdpr/
Thanks. I Googled the subject and there is no way for the user to delete his/her account but will have to rely on Kijiji staff to do so. http://www.accountdeleters.com/kijiji/
Advice: Never book into Hotel California because:
"you can check out anytime you like but you can never leave"
Advice: Never join the Mafia because the only way you leave is in a pine box.