Vodafone India — misguided while giving connection

Sir, i have been given a connection saying rs.270/- rentals with unlimited calls and 21 gb data for 28 days. On 4th day when i came to know that unbilled amnt is rs.270, i immediate rushed to vodafone store and there i came to know that it was rs-499/- rental. I asked there to cancel the connection or make it prepaid as i am not in a situation to pay this amount. But vodafone refused to accept this on the ground of lock in period. I left without any solution.

Now i have been given a bill of rs1500/- which i am not able to pay it.

Kindly settle the matter