Hindi Speaking Bong - 3

Having learnt his Hindi from Biharis settled in Kolkata/Bengal (who proudly claim to be Hindi speaking Indians). But the truth is their toungue is either Bhojpuri/Mathali or some other ill-conceivable dialect, which is different from Hindi, having grammer similar to Bengali. So the Bongs keep making the same mistake as the Biharis.
Having embarked in a Metro city he finds two different Hindi being used I)  Hindi spoken by the Hindi speaking politicians  and II)  Hindi as spoken and used in day to day life, also known as Spoken Hindi, which is also used in Hindi cinema and songs. The first one is heavily tainted with Sanskrit words whereas the spoken Hindi is more punctuated with Urdu words that is borrowed from Farsee and Arabic.
So apparently Urdu and Hindi are same as far the grammar is used , only difference is the words e. g.,  alfaz (الفاض) in Urdu and Shabd (शब्द) in Hindi, and also the script of the two languages are different.
So the Hindi speaking Bong gets confused and keep speaking Bong Hindi and he has no scope to learn the spoken Hindi as Urdu is not taught to Hindi students. And the Netas Hindi is not acceptable in day to day life. The problem can only be solved by the linguists dealing with the subject.