Study centre doesn't look like they even studied

I received a mail from S****s Academy I will receive a discount if I settle the account on the 16th. I spoke to Sheline for the settlement amount. I paid this on the 17th. I sent Sheline the proof of payment on the 17th on mail and WhatsApp. I asked her on the 17th for the statement and to assure there is no debit order going off on the 26th Jan. I called her today again and waited on the line until I receive the statement, to only find out today the debit order going off will still be going off for this month only and I can reverse it at the bank, but now I am liable for this costs. I am a single mother who did this corse to better my future and I work on a strict budget all ready.