Hmmm, it's strange that you're not receiving any responses. Maybe send a polite text saying that you've sent an email and look forward to hearing back soon, or something along those lines?
Email is my preferred method of contact for a number of reasons:
1) As Saige said, if every single enquiry was in the form of a phone call we'd be on the line alllll day. I set aside two "Office Time" sessions each day to read and respond to emails/messages at my desk. It's good for me to be in a quiet environment, with my planner open next to me, to really focus on what I'm reading/writing/saying.
2) Emails allow the client to carefully consider what they're saying, ask specific questions and provide as much information as possible. This is way more helpful than a 3am text requesting "Do U dO cIM? NOW?"
3) Text messages or phone calls tend to demand an immediate response, which I am unable to provide most of the time (eg: I'm in class, around family/friends, etc). This can lead to an influx of follow up texts/calls in which
some clients appear to be having nervous breakdowns or even become quite aggressive. However it's expected that an email may take a few hours to respond to.
I do understand that I'm running a business, which is why I set aside "Office Time" to take care of correspondence. I note that I am rarely able to accommodate last minute bookings on my advertising profile, so prospective clients generally understand that I am not surgically attached to my phone