Having worked in IT for the past decade, I've been an IT Recruiter, a Programmer, an IT Trainer, and an Application & Database Developer.
I sympathize with your situation. I too have experienced your exact issue. It's not only one of the most difficult conflicts I had to face, between looking busy vs. stretching the task, but it was the single most eye opening professional experience I've ever had to divide and conquer.
I had to make the decision that I was going to immediately and consistently begin to document everything. We built a web-based IT Support Request, each request askin the sender for a priority of the request (1 - 4) qhich was auto eMailed to our blackberrys. This eliminated the need to prove we were busy when the IT team's beepers constantly were going off in the office.
Employees would see us zoom by them, and also zoom into their office, ready to help.
After such tech calls, I would return to my pc and send out an eMail informing the employee and their supervisor that the "error they faced is temporarily fixed, and was being investigated", or after an install I would send out a global eMail indicating "the new super color printer is available on the 16th floor".
I believe this is crucial, as posted by another reader; "measure for example the number of issues you receive each month". A ticket system produces invaluable reports which are always great handouts to upper Execs/Mgmt. in a bi-weekly meeting. Talking about your schedule and trying to convince them - vs. - the company analyzing your ingenuity due to tangible items such as those reports - are two completely different things.
Whenever I had a few minutes, between installs or other tech support, between coding, or developing training content...regardless of whose computer I was sitting at, I would blackberry the next step. The numerous amount of eMails. Four times a day, I sent out an eMail to someone, or to a group. Ultimately I was sending out eMails to groups, eMails to individual employees, eMails to Executives, eMails to my manager, eMails to specific departments. I let everyone know of the new developments amongst our team, and the projects we were involved in, over and above our usual tech support role as they saw it. I let our departments know how the new technology we purchased would help them. I pointed out business value to them.
I not only setup New Hires, but then I eMailed the New Hire with a cc to their new Manager, and my Manager. I introduced myself and our IT team. I began training employees, and developing all software content.
Basically, I realized that I had so much time on my hands, I ended up keeping extra busy, and earning a 15% raise with a few thousand dollars year end bonus, for 6 months of my new found communication technique.
In a nutshell, expand your own role, begin creating your position, document everything, and
communicate extensively via eMail. Put it in writing, and they will talk about it, and won't have time to question or wonder.
Hope this helps. Good luck.
Sandra