The easiest way to get your voicemail in order is to either contact customer service at *611 or head to a local store. Ask them to reset your voicemail. When they do, you will get a new temporary password. You can use it to check your voicemail, then if you like, you can change it through your phone.
All you need to do to resolve this is call customer service or go into a store. There, they will be able to reset your voicemail password. At that point, if you like, you can change it to whatever you wish.
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the fastest way I've ever been able to reset the password is to dial *86 from your cell and when it prompts you for a password, enter 4 random digits. It will tell you did it wrong and then repeat 2 more times and then your account will inform you you need to reset your password and lead you through prompts to do so.