The worse service ever

When I phoned Microsoft to cancel an Assure Renewal Subscription, even though I explained EXACTLY what I required, I was passed from agent to agent to agent, and every time, I had to wait and wait and wait and then I had to repeat my story again and again and again. And I was cut off on several occasions after waiting on the phone for ages. I gave each agent all the information they asked for and still they could not cancel my subscription even though they had already deducted the money from my credit card and I had given them the contact email address. I have been trying for a week to resolve this matter with no luck. I have just been told that they need my domain name, which I cannot remember, otherwise they will NEVER cancel the subscription. So unless I can remember the domain name, I will have this subscription until I die! Unbelievable how they cannot link my credit card and email address to my subscription in the 21st century!! I believe that Microsoft has given me the worst service I have ever experienced in my whole life and I will never recommend them to anyone.