Voicemail notification not dissappearing

Hi
As title says. It does not dissappear. I have no voicemails, i have everything setup. People have left me voicemails and I've deleted, still no good. Cleared cache and call history and stopped Phone app service, still no good after restart.

Samsung S20

Settings / Apps / Phone / Notifications and toggle off Badges is what stops it on iPhones. Maybe there is a similar path to take on Android. All the best