Disabling Authenticator issues

I recently got a new phone and my authenticator didn't transfer over to the new one. Went on the support website and they said I could disable the authenticator through email, but I didn't get the email so then I had to submit an account recovery ticket. Problem is they've denied all my appeals because I don't recall the exact month/year I created the account or what ISP I had at the time. I tried submitting receipts for all the times I purchased bonds through the Google play store, but they still denied my appeal. Should I just consider the account lost at this point? There doesn't seem to be any other recourse for me other than continuing to submit account recovery requests and hope. Any suggestions would be appreciated.