Hi Ap,
I have faced the same issues on the phone. Before I started validating Try SET along the lines of of
S."I'd like our phone converstions to go better."
E."It must be frustrating that I don't have a better read on what your concerns are"
T. "how about we talk about this when I get home tonight?"
My W stated that she finds this approach patronizing but it has the effect of acknowledging her concerns about my lack of mind reading

and the comittment to "talk later" reduces the feeling of abandonment - even though we never would talk about it later. That's because none of what your W is expecting of you is rational - but it is how she feels. The feeling will pass if you validate.
And by the way, you can also set a boundary around not taking her calls at work. Use call display or otherwise screen her calls. Y