HDFC Bank — Loan settlement

Hi iam sikandar sharief
I had a loan with HDFC and due to no income and financial issues they gave me a settlement amount of 1 lac 65k in 4 installment and later i requested 1st installment i wl make 25k they agreed and later ther sent a letter for 41k emi monthly for 4 in which 1st emi i have paid 30k and 2 days prior i email and bank manager that 11k including i wl make on upcoming emi he never replied and later ther said it got upheld settlement but no were they mentioned in the letter and now they are harrassing and extortion ing by visiting office after making 30k payment last week kindly look into this and help me out