how to find old voicemails in the cloud?

Hi,

I lost my mom in 2017, and along with that were all of her voice mails on my iphone. I have always backed up my iphone to the cloud, and as new voice mails came in, older ones started to disappear from the history. I never deleted them. I know they are in the cloud somewhere, but I can't figure out the path to retrieve them either on my phone or computer. I really would love to keep mom's voice messages when she called me.... I miss her voice.... Please help?