SpinVox
SpinVox 'converts your voicemails into text messages and sends them straight to your mobile phone or email'.
Perhaps of interest to Deafies who still get annoying voice mail messages, despite telling people to the contary.
There is a 7 day free trial and pricing plans that start from £5. For Deaf business users or employees, perhaps this might be claimed back from Access to Work?
Alternatively, just do what I do, and ignore. If the sender wants to be so stupid, then its on their own head ...