Recognizing Ctrl+KEY in case in bash

I've searched forever for an answer and cannot find one, so now i must ask.

Im working on a script in that creates a textstring as a T9 Numpad (without the dictionary) by cycling through each keys letters. All of it is working except handling backspace (a real backspace on the numpad). I use "Read -n 1" for the inputs and as far as i have learned backspace maps to "^?" and as far as i know the "^" corresponds to ctrl being pressed while typing "?". I cannot get a case to handle this input, and i dont know what to do. The code works if i substitute backspace for any single key i.e. "-". So i only need to know how i would be able recognize the backspace in read -n and case