Incorrectly debited my account

I paid the balance of my vehicle finance account after receiving my settlement amount. I was still debited with an amount of 1421.52 this month though? Please refund me this money as I have already paid off the account, I have yet to receive any communication regarding next steps to get the vehicle in my name. Your ***number is also down so cannot get a hold of you.. Will be seriously ****ed off if I don't get this money back.