Shocking service

Been trying to cancel my private clients credit card for over a month now. Paid up in full, went into branch on 29 July, signed docs, gave alternative bank details in case of debit/credits necessary. Was told it was closed. I then went onto secure chat a few days later to confirm, they told me it was in the process and would take 7 to 14 days to close. After more than 14 days I called call centre as it was still showing on my app, now with interest gone off. I was told the account was NOT closed and that they would look into it and revert back. No feedback since. Shocking service.