Please let us know where our advertising says that it is free to send a fax and we will change it immediately. 
 

In the meantime, we feel bad that there was a misunderstanding. If you require sending a fax from your FaxBetter fax number, we would like to offer you a three month upgrade for only $5.85 (Thats only $1.95 per month).  Use promotion code 331244.  Upgrading to this plan will allow you to send faxes. If you like the service, do nothing and you will automatically be upgraded to our yearly service plan at a 20% discount.  If you don't then just cancel by going to this link before your 3 month promotional trial expires and you will not be charged again.

Alternatively, if you wish to simply send a fax for free from a random fax number, we recommend this site.