Double debit

I'm really fuming right now because I changed my debit order date from 25th to the 1st. You debited my account on the 25th and again today with the same amount of 1048. what makes matters worse is one of lines is canceled so why am I still paying the full amount. if you charge me on the 1st for changing my date it should be a prorated amount not the whole balance..I need my account refunded asap. At this rate it makes sense to cancel everything