Credit card is unable to do their job

I had my credit card for about 15 years, never was it in arrears as I managed the payments myself. From May 2018 you decided to take charge of MY account via debit orders without informing me so I paid you twice in May. June's debit order went off, no problem. July: never went off, when I informed you, you said you had a problem with your debit order system. I specifically said don't take make now as there isn't in my cheque account to take. You ignored my. Phone me every single day before 8am. I explained that I will settle the whole account by 03/08/2018, still you harrassed me daily. I laid a formal complaint with Wayne Fick. A lady phoned me and basically said I promised a payment by the 15th of July, which I didn't. She said she will investigate and come back, which never happened. The 3rd of August I settled my credit card as promised and requested that the account be closed. I was informed it would take 3 working days. Today is the 14th, nothing yet. Again, more interest was charged because YOU didn't do you job when a client requested it. You just took MY money as YOU please! Now I'm told the someone will respond to my wanting to close the account within 7 working days???? You make me sick! I want this account closed so you can stop taking money that doesn't belong to you!