I know I'm a little late to the party, but I've been looking through the forums because I've got the exact same problem and it's complete garbage! I have 20 months left on a 24 month payment plan and took up the 4 month interest free period for another item. I made an extra payment thinking it would pay off the sooner ending promotion, but NO! It decided to split the payment proportionally over the 2 outstanding amounts. I rung up and they said that's just how it is and would have to wait for the promotional period to end on the 4 month item and THEN pay it off in full so that it would not affect the payment plan. I hope you got things sorted out. I cant see myself ever using PayPal Credit again after this.
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