I would give it a 5 star because it is a wonderful feature to pay an instalment over 6 months interest free

I would give it a 5 star because it is a wonderful feature to pay an instalment over 6 months interest free. However, my problem is with the uncleared amount on my credit card that is reserved for the payment. It appears the same amount is reserved every two weeks but the previous uncleared amount was not cleared, that means instead of one amount in reserve 2 or 3 times the amount is in reserve without me buying new stuff. It sounds complicated but all they need to do is clear the previous reserve or reassign the reserve for the same instalment. I brought it to their attention already but there seems to be no improvement.