Change Account Holder Name

The previous owner of my home contacted Hughesnet to change the account name over to me (the new owner of the home).

That was August 2 2018.

Hughesnet has documentation of this conversation but never terminated the account in the previous owner's name.

I did activiate the account in my name but I CANNOT make any changes to the account or service because the previous owner's name is STILL the primary name on the account.

Help!