SBI Credit Cards — Unnecessary charges against blocked card

I hv sbi credit card.since 2004.I have not been using since 2016.no kyc done.card is already blocked .phone number linked is surrendered many years back.no e mail registered.already blocked.when asked to cancel online reply come only that contact through registered mobile number or email.Wrote many letters.not cancelling.unnecessary taking annual charges in block card
Dr suman kumar