Emission Norms BS-III / BS-IV??

Only ONE point is bothering me - the Emission Norms of the Vento TSI 1.2 HL (2015 model). Can anyone confirm whether this car is BS-IV? I can't find a single document from VW / Dealer that supports this claim. Recently, during a PUC check, the vendor categorically told me that my car is BS-III, now that came as a BIG surprise!!!! I also have a Polo GT TSI (2021 model) -- here too I couldn't find a single document that supports the claim that it has a BS-VI engine.!!!