Taking money from my account wrongfully.

I took a 6 month loan from Wonga in the beginning of May 2021. I then decided to rather settle the loan on the 18th of May through their website. They never allocated the money to my account, and still deducted my bank account at the end of May. I have sent them numerous emails and received no reply. I phoned them and they told me to email them proof of payment. I did that, Its now 4 days later and I have had no response from them, and my account has still not been updated. I need them to refund the payment they wrongfully took, and update my account as being settled.