From what you've mentioned, there's more than enough cause for you to file for divorce immediately without much delay. I would suggest filing an NC with the local police station and the Woman Cell as well as copies to the CWC and the Commissioner of Police to ensure that no authority is mislead by your wife to file any false 498-A against you and/or your family.
With reference to your specific question as to validity/use of the recordings as proof, in my opnion, the recordings properly introduced will act as substantial / collaborative evidence towards the acts of cruelty that you may describe in your petition.
Best of luck!
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