Trying desperately to cancel my plan

This is SUPER annoying and frustrating. i got connected with customer service a few months back as i tried to cancel my plan. found out it is yearly plan and i can cancel it today. i tried again today multiple times, but it always only show "error occured"!

How is this possible? do i have to tear up my credit card, so that they cant charge anymore from there? i understand you guys make a business, but this makes me feel super angry and definately will not ever come back to using Adobes products as it is a life long jail.

You propably can see my user name - if there is anybody who can get the message through please do it.

Just sick and tired of trying already...