[US] Issues with fax

I'm currently experiencing two issues with fax. I've tried to speak to an agent via Live Chat but no real human agent is available after waiting over an hour :(

1. My client tried to fax the document to us, he kept getting the 'line is busy' signal. (tried two different days) We have a separate fax number from the phone number and no other fax was received during those times, so not sure how the line could be busy.

2. I faxed the PDF file from RC App to a government agency, but the recipient is saying that the received file appears almost whited out and would like me to replace the ink ?! I asked if they are using the traditional fax machine, she said they are also using the electronic fax.

Would appreciate any help!