Hi,
Dear Karam, when you had applied for the loan, then whoever was the staff who have processed the documents he must have given you the Calculation sheet in which the Total Amount + Interest + Insurance + Commission charges must have mentioned and possibly you might have missed to read that. Beside that whenever that Calculation sheet is prepared the staff not only shows it you but also consult with you that this is the duration, monthly installment, interest rate and amount, etc and at the end when you agree to all of that, he will take you signature on that sheet and then attached it with the Loan Documents.
Another thing about the staff, that might he had left the bank, because normally the DSA's they don't stay in a band for a long period or might be there is some other.
I was an employee of Doha Bank and it is not that I am defending the bank, as I have already left the bank, but actual I believe that Doha Bank have more clear procedure and almost no hidden charges. And believe me I am not defending the bank, its my experience especially compared to Commercial Bank.
Best thing I suggest you to go to the Branch where your account and loan is ask them 2 things. First your statement (it will show the charges details) and Second the copy of Calculation sheet. Your confusion will be cleared after that.
Thanks