Could you please refund of the payment of the 500 persons for one month

By mistake I clicked the payment for one month for 500 persons.

Right now I am managing the zoom conference. The number of the participants of the meeting is little by little increasing. That's why I was preparing the payment page. But it was my mistake that I touched the payment. Therefore it was payed automatically. 

Please understand of my meeting number was 87 persons in maximum, of which number was never more that 100 persons. Could you please refund the payment of 500 persons for one month. It was just my mistake. I would like to say so sorry for your inconvenience. 
I am looking forward to receiving your kind reply.

Byongho