if u paid 2x this month, let it be. pay the next month as normal.

call the bank and inform them - and ask them when is the final payment due for the loan. they will tell you a date. and tell them you already paid 2x and the end date should be 1 month earlier.

they will take note of it.

but dont assume next month payment is already paid if u paid this month. banks are a little.....static when it comes to this