Voicemail problem since Nov 23, 2024

My visual voicemail stopped working 11/23/24, so I called Tmobile and they fixed it, but in doing so deleted all my old voice  messages including those from my mother who died in February2024.

I know these voicemails are on the Tmobile server, but 4 phone calls and 2 emails to tech experts telling me they cannot retrieve them is not what I want to hear.

Any advice? I have a Samsung 23  5G phone and all software up to date. Tmobile struggles with their voicemail in general. I have been with them > 20 years. I did save all my voicemails, but did not back up to another source.

Please help...