Ramos Iron Works

I called these guys to get an estimate on some work on an iron security door at an apartment in Boston. The locksmith referred me to them.
The guy on the phone said it was the kind of job they normally do, and asked me to send some photos via email. I emailed him the photos. That was 4 weeks ago. Since then, I have called and emailed several times. Each time I call, their voicemail box is too full to allow leaving a message. So, I have not gotten through. They don’t respond to email. I have never head back; no estimate, nothing.
I don’t get how a contractor can stay in business if they don’t respond to customers. If I’m going to hire someone to do a job, I expect them to respond in a reasonable amount of time. Even if the job is too small, they should at least reply and say so.