Unwanted Voice Calls

My question is, how can I deactivate receiving voice calls of all types. I'm a relatively new customer, my phone is listing spam calls. Now, in the first place, I never wanted any voice features. But economics forced my hand. I'm Deaf, so have no use for voice calls. However, T-Mobile charged more for their hearing impaired service than they did for services designed for the elderly. Being elderly, I took that service. I don't want any voice calls, despite it being a feature of my service. Is there any way to deactivate voice calls?