Income Tax Department — can't given gst invoice

Address:

533238

I bought slippers in sri sai balaji shoemart shop in ravulapalem ringroad, near syndicate ravulapalem.
We asked invoice they can't provide but they charged gst extra also, after visited second time bought shoes we asked again bill they provide quotation bill so i strongly asked gst number they fighting with me. After one of friend said about that shop they are doing like that 9 years onword s and they earned 5 crore block money but they are very less tax payers, and they are trying to buy houses and lands when
Demonetization time but not possible after they doing finance business secratly and they trying to construct new house through bank lone approve way. So these are secrates told me.