New LG Optimus doesn't give voice mail notifications

Hi all,
Brand new to this forum so I hope this is going to the correct place.
Anyway, Just received an LG Optimus LG-MS690 as a gift from a friend.
New to Metro PCs as well.
I find it very odd that I am forced to go to a corporate store just to get simple tech support, horrible phone support robot!!! The corporate store has no phone????
Of course I have had to make two trips now for simple number porting and billing errors.

Now I have a problem with voice mail notifications , I don't get them! at all. I can't find anything about it in the manual and so far nothing online. I am hoping someone can help with a solution that doesn't involve another trip to the corporate store.

Any help is much appreciated. thanks