Shocking service

My first shipment experienced some delays due to incorrect billing, and delivery details.<br> I requested that they be corrected in order to eliminate any future delays, I updated my delivery and email details in August 2015 and again in October.<br> Needless to say they were never changed by FedEx and the same delays occurred, on trying to sort the delivery out I have called more than 6 or 7 times per day, sent several emails and received several promises that someone will call me back.<br> To date not one person has called me back. <br> I have paid for my shipment upfront but no service has been forthcoming.<br> I am currently on hold for the last 26 minutes trying to speak to a supervisor at the call centre.<br> <br> FedEx service stinks