changing the authority for download my website

one of my employees bought this website

but he suddenly left the job, now I can’t download the latest version of the website so can you help me with this.
I have the bills, bank reference number for the payment and the website code. I have all reference if needed

unfortunately, it will only be available to the purchasing account. Without access to that account, it will not be possible

no other solution
he even didn’t accept to download it and send it to me