Basically, I was in the process of setting up a payment plan with Payday Express, and agreed to send in my wage slip on Thursday to confirm financial difficulty so they could start a payment plan. Then over the weekend I checked my bank account and they have debited the rollover interest on Saturday, even though I have been in contact every step of the way, saying the letter has been posted, and then again on the Friday to check if it had been received, which they had not. I rang up to see if the interest payment could be refunded, or a least taken off my bill and they said no way. What can I do?