The contract under which the car was purchased will state when interest becomes payable and how this is calculated. It is very common if you miss payments for interest to be charged on the amount of the missed payment until you settle the outstanding sum.
If you are concerned about th amount you think they have charged too much then ask for a detailed calculation of how this interest was accrued to be sent to you and compare that to how interest is stated to be calculated in your contract. You will only have to pay interest at the contract rate.
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