My case manager used to torture me with questions for an hour or so over the phone. It was 7 or more years ago. I told her that I would need all the communication to be in writing via email or mail as it was mentally very difficult for me to go through all those long interviews. So we agreed on it.
I have changed many case managers ever since. When they call me, I don’t answer the phone. Then they send me an email about me not responding to their calls. Every time I have to remind them that we have a prior agreement with Manulife that all the communication should be in writing. They apologize and never call me again. Well, not until my case is transferred to a new office.
You should probably send your insurer a request via email or mail for all the communication to be in writing as phone interviews are causing you a lot of anxiety and mental distress.