change number of rings in voicemail

On Thursday I spent an hour on chat with Xfinity live agent and I was on chat for 1.5 hours yesterday and my issue is not yet solved. I'm frustrated because although the two agents I spoke with were very friendly and nice, they spent more time trying to sell me on Xfinity cellular service than solving my problem.

All I want to do is change the number of rings before voicemail picks up our calls. I do not have the options to change this on the Call Forwarding screen, so the support articles on this are worthless to me. I have tried both on my Windows 11 computer and my Android phone. When I Google this issue, I see that I am not the only one with this problem and see some posts from two or three years ago, so this is not a new issue, either.

I put the brakes on switching to Xfinity cellular yesterday, even though it's a much better price than our current carrier, because my husband's tablet is not supported, but also because after 2.5 hours on chat, I still have not been able to change the number of rings before voicemail picks up. I did not contact Xfinity to change cellular carriers and now wonder if all the delays in fixing my voicemail problems is a plan that the company has put into place to keep customers engaged so they can pitch their sales.  I am very hesitant to reconnect with Xfinity support chat, again, because I will get stuck for another hour or more and they will push the mobile services, and still not solve my issue.