I want to decrease plan

[khailt]

I purchased 3 licensed Webinar 1000, but now I no longer need that much, I want to keep 1 licensed Webinar account only. However, on March 22, Zoom issued the invoice for 3 licensed Webinar 1000 (I forgot to cancel before March 22) I cannot pay that much. So I refused to pay the invoice, is there any suggestion for my case?