Google India / Tez — Not refunding money deducted from Google Play

I had downloaded the 7 day free trial version with an option to cancel of the Dumpster APP and Google deducted the entire amount with no option to cancel within the trial period. They are now not refunding the money.

This is illegal, unlawful and unprofessional. We trust Google with our credit card details and they dupe us by charging it for transactions which are not valid.