Please cancel that credit card, please, please.

I am not sure on what to do now. It has been a week now, requesting FNB to cancel they credit card under my name. But it seems like they are not willing to do so. Last week on 07th , I called their call centre, to request for a cancellation. I was advised that, an email was sent to the relevant department. Thereafter, I made a follow up call on 11 March 2019, and I was advised that I should be given a call by the credit card department, reason why? I don’t know. All I want, is to cancel, I don’t need any phone call conversations. Please cancel that credit card, please, please.