Help Airplane Mode Not Working

Anyone else possibly having this problem?

Samsung Note 2... My workplace gets no reception, except for a small corner in the room that sometimes gets me a bar for a short moment. So, naturally, I put the phone on AIRPLANE MODE.

On several occasions, while the phone is on AIRPLANE MODE, I receive calls and texts. The phone will ring, I can see someone calling, and if I pick up I can talk. All the while, AIRPLANE MODE is on, little white airplane icon in the top right.

Can't seem to find this issue or possible bug documented anywhere.