Smartfax Scammers, will not cancel and overcharge for services Internet

I needed to fax a medical paper quickly and chose Smartfax to send it.  Big mistake!  After I was finished and looked for a way to cancel the service (before the free trial ended), I realized there was no way to cancel on the website.  I emailed the company and requested they cancel my account.  

I noticed a $50 charge from them a few weeks later with an email explaining they will not cancel the account via email. They completely igonored the fact that I was charged a $50 fee for a $6.95 service.  I called the company and asked to cancel and was told they could not do it.  They kept asking for more personal information and said they couldn't cancel unless I went through all of my bank account numbers, credit card numbers and social security number.  

These people are completely unethical!  The person was obviously from over seas and refused to let me speak to a supervisor.  I was livid and hung up.  I have contacted my bank and they are currently taking action against this company.