Noise cancelling cancels out my voice?

[VooDooCC]

Not sure if I should try taking the phone back to the store, or rig a fix myself. Whenever I use the phone, the person on the other end can hear the first syllable, then it either completely cancels my voice out, or it sounds distant and echo-y. If I hold my finger over the pinhole for the noise cancelling mic on the side, it sounds perfect. It's not the most comfortable way to hold the phone though. I'm wondering if other people who had this issue were able to get a new phone to fix the issue or have to just put some tape or something over the mic