Voicemail notification keeps popping up
For the past month the voicemail notification will start popping up randomly throughout the day. Just in the last 10 minutes it's popped up over 6 times and it's becoming really annoying. I've tried turning off the badges notification and turning it back on, I've tried restarting the phone but nothing is working. I've also checked my voicemail and I have no new messages, not even old ones.
Can someone help me with this, please.
iPhone 11 Pro Max