Negative balance in demat acc

#1
My broker using my POA executed trades and the brokerage company never informed me, now not only my initial investment of around Rs 50000 is gone but my account is showing a negative balance of more than 150,000 which comprise mainly of delayed payment charges, what happens if I choose not to pay the brokerage company to settle the account since they never informed me of this DPC in spite of repeated emails? I came to know of this only via SMS received from MCX and upon further inquiry from them.