Fix MP3 recording

I recorded a phone call today using a voice recorder app. The person that I was talking to sounds like a chipmunk. I need some who knows about recordings and how to fix it to take this job. I need to be able to hear what he is saying.

Any question please ask:

The recording will be attached below. Please listen to it and be sure you are able to do the job before bidding on it. The whole recording is 3 minutes and 23 seconds.

Thank you