Don't deserve 1 Star-Poorest service

Following up on the bad service i received last year Dec on the 8th the lady clearly did not process my cancelation and now is my problem, i have been following up on this cancelation for days and been told back office is working on the issue, today I was on hold for 25 minutes only to be told that back office is working on the case, i requested to speaker to the manager & they refused & said will call back in 5 minutes few hours later I'm sending this no call no email. Never renewing any contract or upgrade will move to MTN, please stop sending me your offers or calling me to upgrade I'm no longer interested in your company