Impossible to get a response from Fedex - sub zero value

Unable to even settle my account because despite many promises to sort the account out and even more emails from me asking them to actually get on with it, absolutely nothing happens. Every week I am sending emails to Valdemiro Macome and Saloshna Cristwell with no response received. Calling is hopeless because you end up with a call centre who tells you to email them. They don't respond either. How is Fedex actually still in business ? Clearly the owners of the company are out of touch with reality or just don't care.