Terrible customer service meaning I can’t cancel my credit card

I have been trying to cancel my discovery credit card for two weeks now. I purposely called discovery to cancel my credit card in May so that it would be sorted out before June and I wouldn’t pay The bank fees for an extra month. I still have a working and active credit card, even though I have called in 3 times to cancel, and every time I’m told it will be done and they are sorry and they will email me the necessary forms to finish the cancelation. I still have no forms. I’m not moving to discovery bank, and now that they have changed the credit card from FNB to discovery bank, I do not want an account with them. I’m sure they are very sad to loose my business, but if a customer has to call a fourth time to try and do the exact same thing, your customer service is useless.