I was contacted by a Randstad recruiter, more or l...

I was contacted by a Randstad recruiter, more or less, a month ago. They were searching for a senior professional on behalf of one of their clients. We met with the recruiter in person. Then she asked me for references. I contacted two of my previous employers and I sent the contact details through. She has neither replied to my email or my follow-up. It's been more than 3 weeks. I find this quite unprofessional. To sum it up, if you respect your network connections enough to not contact them without a reason and trust your abilities and skills, don't bother with them.