iphone voicemail greeting

Update...I have spent an additional 2 hours on chat with support, gotten transferred to multiple different "experts" and no one knows what to do. I am to the point now where I want to break my contract and ditch this service. Too bad they won't let me out without having to give up my first born in fees and charges. So unhappy right now. Three months without a functioning voicemail. I miss the old Sprint. Was a loyal customer for a couple decades. What terrible customer service. The had opened me a ticket and allegedly called me about it. ONCE. It was so early in the morning I was still asleep. Since my voicemail doesn't work I had no opportunity to call anyone back. And they only called me this once. Now this last time with chat, and I am having to repeat the same troubleshooting over and over and over with each new person they send me to. I am so done.