Poor credit card arrangement decision service

I made an arrangement on my credit card in the beginning of the year. 3 weeks ago I wanted to cancel the arrangement and proceed with normal payments on the card. The full outstanding amount on the card was settled and I was told the arrangement will be lifted. 2 weeks later the arrangement still had not been lifted. When I contacted them again I was suddenly informed that I need to send an email to lift the arrangement. I did that immediately. 1 week later the arrangement still has not been lifted and THEY CHARGED ME INTEREST ON THE ARRANGEMENT. This is now affecting my home loan process and after numerous phone calls I am still unable to speak to the devision that is supposed to lift the arrangement. I have contacted the complaints department as well and no one is assisting me. It is like they are completely ignoring me even though I have been banking with ABSA for over 20 years.