What's the next step?

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I've been working on a contract (without benefits) with a certain company doing POS and Back Office Technical Support for about 10 months now. I'm one of 2 remaining from the original class that brought the contract pilot to a full-on 3 year contract. In the last 3 to 4 months I've been passed over on at least 2 separate promotion opportunities, though I've been a model employee. Since our office moved increasing my round trip plus toll now, adding on an additional $188.00 a month in work alone related travel expenses, and our workload and responsibilities have almost quadrupled, I finally decided it's time to move-on, hopefully to another assignment with my current contract agency. I wrote a rather detailed letter to my contact with my agency, sent it via email got a "read receipt" within about 10 minutes, and now it's been 3.5 days without any kind of follow-up from my contract agency. No call, no reply email, nothing being said at work, total silence. It's almost like I never sent anything at all. So my question is: Should I make a follow-up call or email to the contract agency, or should I just leave them alone and continue on with my private job search? Any comments or suggestions will be greatly appreciated.