IBNtel Terrible, Charging for calls never made, Rude, Blackmails if you mention you will complain to BBB Oakton Virginia

I had been a customer with IBNtel for many years. For approximately one year I however have not been using their phone service. I did get an online bill over the last couple of month with phone calls charged on my account. In the month of August I had 6 phone calls billed to my account. Apparently all this calls were done calling my home with my toll free (800) number.

Interesting part is that my family was for the whole month of August in Europe. There was nobody in our home to answer the phone calls, no housekeeper, no gardener, nobody... for the whole month!!!
Most calls were 7 or 8 minutes (my answering machine would not record over 2 minutes... )
When I called IBNtel about this they told me they will not correct or adjust the account. The only person working there 'Gabriel' actually threatened me that if I don't pay the outstanding $5.36 they would charge me an additional monthly fee going back to about 6 month.
I told them that I would like to a supervisor. 'Gabriel' told me there is no supervisor and he is the only person there and there will be no other person I can talk to.
Next, when I mentioned that I will file a complaint with the BBB, Gabriel told me than our deal (where I can just pay the $5.36) will be off and he will add monthly maintenance charges to the outstanding charges!
Since it is such a small amount, I just paid the $5.36. Again, none of the calls were made from me or for me.