Two accounts - one pro and the other free

I am a self employed on line English teacher and for many years had my own (my name and email) free Zoom account.   Then last year I was offered some subcontract teaching by a third party - and their Pro Zoom seems to have wiped out my own free account.   I've tried setting up a new Zoom account in my own name, but I just keep getting referred back to the other company's zoom.  Anyone got any ideas as to how I can overcome this?