Unable to cancel my current Zoom Pro + Whiteboard subscriptions

I have had a paid account since last year. Now I want to cancel both the subscriptions Zoom Pro + Whiteboard, not able to cancel from my end. The 'Edit Current Plan' and 'Cancel' buttons are disabled.  

I ask you to help cancel the Zoom One Professional + Whiteboard subscriptions

Thanks & Regards

Sap

Art-Tuts