Cancelling uneeded subscription

Hi,

I subscribed to 10 standard assets a month but after three weeks it turned out I won't need it so I wanted to cancel.

Problem is I was not able to do so, because in Chrome on Mac plans` management section of my profile literally doesn't work - I'm getting the blank page (see an attachment below). I tried to contact with support on chat, but as you can guess nobody was able to help me there. I was left alone with no any answer. Wrapping this all up - my plan has been automatically extended to the year subscription and I literally lost ~400 Euro, because I got something which I don't need and will not use.