On my latest phone bill, there is a charge for a call I made (didn't) to this number for 59 minutes and costing $150+.  Anything I can do.  We did not make nor receive any calls to or from this number.  Thanks.

I saw "GDI" on Caller Id.

This is the number of a free conference calling service you can sign up for on the web called freeconferencecall.com. it could be anyone.

This call is for a company looking for "workers" to help them sell stuff. Chech out the two websites down below for more info:
http://newemployee.ws/
http://website.ws/newemployee

Hope this helped!!!