Just keep sending emails,They will answer soon. by the way, here is a free article submitter on the market. It has to be paid for to expand, but you can submit enough with the standard version if you are just doing a couple sites or bloggs. And then you do not have to pay for submissions and can speed the process up.
Internet Marketing Wish List | Article Submitter » Article Submitter
Just do not buy the full version, as a single site owner or if you own just a few sites, you will not need any other submitter.
If you want massive exposure, i would suggest articlemarketer.