Unauthorised Debit Order for December

Much to my surprise, my account was debited today 17 December when contractually debit order is for 25th of every month. When I call Wesbank , I was told by the representative that because people are getting paid early in December therefore debit order was moved to earlier date. My message to Wesbank , it’s my money and my bank account. Who are you to determine when I get paid and when you can take your money.You have no right to do what you did,I have not defaulted on payments. You are breaching the contract. I would like to know if you now going to pay all the bank charges that are incurred for the reversal. I won’t accept this bullying tak tik and if you think I’m obligated to you , please come fetch your car and cancel this agreement. You are very unprofessional. Debit order is 25th . Get this in your freaking head.