You can easily delete your PamFax account via the PamFax Portal.

Log in at https://portal.pamfax.biz, go to Account, scroll down and click on Delete PamFax account (pink button on the right). A dialog will ask if you want to delete the account. Check the box and click the pink button that appears "Delete my PamFax account."

Note that once you have deleted your account all historical data, PamFax Credit and all other items related to your account will be deleted. Make sure you apply for a refund before deleting your account!