How to clean static and noise from an old Mono WAV file?

I have an old WAV audio recording that was used for a phone play back system. There is a lot of static and it seems overdriven. I am not sure if the recording is original or not, but am stuck trying to fix it. It less than 20sec and no matter what I try from the help section or videos; I seem not to be getting it right. Anyone care to help out please?

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