High Post Paid Mobile Bill for the moth of October 2017

I was used a post paid mobile connection ~ 5 years and the average bill varies from Rs. 170 to Rs. 400. But while the number is ported to some other service provider the last bill amount is become very high. It is Rs 350. I have met the official in this regard. They only misbehaved no positive reply they have given. The concerned person should be punished for this intentional huge billing amount.