I work with machine shops daily. If they don't call you back it usually means one of two things...
1) They're just poorly run and the employees don't care.
2) What your asking them to fab up is not really up their alley. They may be able to do it, but its not within their usual type of jobs.
When I do get blown off by machine shops, its usually becuase of reason #2. They may be capable of doing it, but its more trouble than its worth for them.
I agree with the post above. I would try a welder for what your looking for, rather than a machine shop. Any reputable place that does welding as the majority of their work, (like farm equipment repair), would easily make a stand for you and would probally love to get the business