Tried several different ways to delete some voicemails to free up space and they will not delete. For some reason several of the VM's were duplicated, I was only able to delete 1 of the duplicates. Callers call my number and it goes to VM where it says the mailbox is full. I have less than 40 VM's so it should not be full and wouldn't be full if I could delete ones that I don't want...please help!