Need to delete/reset MS365 Developer Account

I need help deleting or resetting my Microsoft 365 Developer Program account associated with my email address.

I mistakenly set up the account for Personal Use instead of small business and do not have sandbox access. I tried setting up a new account but am locked out because my phone number is locked with my original account. I do not have another phone number available, so I need to somehow either delete the old Developer account or reset it so that my phone number is freed up and I can rejoin the Developer Program by finishing to set up the new account.

Please advise how I can have this account deleted or my phone number released so I can create a new account.