Endless Voicemail Notification

This was never an issue when I was with sprint and is unique only to T mobile. From my research, this has been a common problem for over 2 years that T mobile won't fix. Everyday, I get at least 40 voicemail notifications from  (805) 637-7243 which is 805-MESSAGE. You clear the notification, it pops up again 10 secs later, and again, and again, then goes quiet for about 5 minutes. Then the process restarts. T-Mobile doesn't allow you to turn off the notification and only gives you the option to silence it for about 2 hours. This is harassment at this point and I wish Sprint never switched to T Mobile.