Sorry I do not use this feature so only have suggestions not solutions
They can delete your account and reenstate it with all software licences unused. You do ythis after cleaning Mcafee via uninstall tool
Reboot then reinstall from your account.
Re the Mcafee tech did any1 say they are escalating the issue and getting a higher level tech to call you? If not best way to go.
Really why cannot you uninstall via the method above and reinstall the delete account bit really should not be necessary.