HDFC Bank Ltd — emi deducted wrongly even if roi decreased emi deducted same as previous

Address:	Ground Floor Omega - Bengal Intelligent Park Block Ep & Gp, Sector V, Salt Lake City, Kolkata, West Bengal 700091, Kolkata, West Bengal, 700091
Website:	www.hdfc.com

I have found many discrepancies in my loan account given below, i want justification for each of them.
Please note almost regularly i use to check my loan account and keep a screenshot of data, and found below data:
1comparisopn of principle and interest amount is not matching with 2 months of data:
I)
Data on[protected] for the period 01/04/2018 to 31/03/2019:
Principal component: rs. 35, 861.00
Interest component: rs. 1, 44, 052.00

Now data on[protected] for the period 01/04/2018 to 31/03/2019:
Principal component: rs. 35, 280.00
Interest component: rs. 1, 42, 175.00

So in one statement is showing for the entire year i am/will be paying total interest 1, 44, 052 and another is showing 1, 42, 175. So justify the gap between the two amount worth= 1, 877/-
Same for principle amount 35, 861-35, 280= 581/-
Documents attached for your reference.

Ii) interest rate/emi change table has given below:
From dt to dt roi% emi
Apr-18 jun-18 8.35 14592
Jul-18 sep-18 8.65 14913
Oct-18 nov-18 8.95 15233
Dec-18 feb-19 8.43 15233
Mar-19 8.43 12775
So from the above table, we can see from december 2018 the interest rate has been changed to 8.43%
Now showing you the paid emi from dec 2018 to jan 2019, (Last emi paid on 5th feb19 for the month of jan2019) is 15233 for roi=8.43%
But in march-19 it is showing emi=12775/- (This emi for feb 2019 which will be paid on 5th march).
Now justify the below: if emi would be 12775 for roi 8.43% then why for dec2018 and jan2019 it has been taken 15233/- which was emi for roi-8.95%??
Give me the reason behind it and adjust the amount worth[protected]=2458 *2 =4, 916/- which is deducted extra for those two months.
Document attached
Iii) here is another mess in the loan summary portal.
Current emi is shown in portal today[protected] =12775 /- but in the field "dues up to 28-feb-2019" is showing 13, 937/- what is the reason?? These two fields should be the same. (Attached old emi summary screenshot for dec2018 with the same roi)
Kindly check thoroughly my account and do changes.
If these types of discrepancies continue i will not have any option than transferring my loan account from hdfc ltd. To another bank. This is not any joke going on.
Screenshot attached.
I need a prompt reply and changes should be reflected today only because tomorrow the amount will be deducted and if deducted wrong, day after tomorrow i will go to salt lake office for my loan account transfer, and i am serious about it.