One97 Communications — Harassment from Paytm postpaid collection team

My post paid limit is 10000 .Because of hospitalization I was not able to pay Postpaid bill on time so they charges 1985.63 Rs.
And on 31st May i have paid 6500 I informed them that balance 5485.63 i will pay on or before this month end but the collection agent is asking to pay today 7th of June itself and on 7th I have received whatsapp message that My UPI will block earliest and i cant use anymore and auto debit will happen from my UPI.

first they send message without name of the financial institution or from where they are messaging.

Its a harassment only.