Credit Card Closure Made Impossible!

My credit card balance was paid and settled in full. The account closure request (together with the signed form) was sent to Discovery Card on 5 June 2019. I received a response that the closure would take 5-7 working days. I requested an update a week later (13/06) and was advised that their internal closure on the card protector and mile was still not done. Again on 21/06 I asked the status and was told that the life protector was still not closed. Why is there such a delay in trying to close this credit card? Why does it take nearly a month for Discovery’s internal dept’s to talk to each other? All I want is to close the credit card and receive written confirmation. Is that really so hard?!?!