Need help with an intellectual property issue where our 501 (C) (3) has been notified we need to pay for license

The question

We--Heart 4 Children Ministries-- received a letter in the mail from PicRights requiring Heart 4 Children Ministries, Inc pay a license fee of $1245.00 for past usage of an image. The letter stated that removal of the image will not satisfy the issue. We contacted the number on the letter and got the voice mail of the compliance officer. We left a voice mail, however no one has yet responded to our voice mail. We attempted a second call but it also went to voice mail. The image has been removed.