Hmmm, I'd argue that there's two separate problems here:
1. The desire to have a working computer, which was validated and solved
2. The desire to be connected to the process and the people they're working with, which was neither validated nor solved
Validating but not solving the second would include some sort of message saying that you know they'd rather a call but it helps you serve more tickets this way, or something to that regard.
3. Understanding, Independence and control. The desire to continue to have a working computer in future, and to have own control over that by knowing what went wrong, how to avoid it happening again and what to do after. "There I fixed it." does not help with this. It is low information and high dependence.
Some would draw the conclusion that the person doing this is deliberately maintaining high dependence. That may be paranoid (The tech person may just be overworked and find social explanations harder than fixing computers) but some do draw that conclusion.