Audio flawed

I purchased this for my son, to assist in learning to read, after much claim for the app. Our audio has not worked, and I now feel this was a waste of money, as well as my time. Very unsatisfied. Would give it a 0 to show its unusefullness, but am not able to. Looks like it would be ok, but without the audio, it is not.

Paddock 21 about Montessori Crosswords for Kids