Paytm.com / Times Of Money — I have purchased a course from udemy app and money has deducted from my account but the course has not been offered to me

Again i paid for the udemy course. Payment has succesfully completed. Money has deducted from my bank account but didnt get the course. The udemy app said they didnt get my payment of course.. I have my transaction id also. My bank account shows payment gateway is times of money ltd. Please refund my money. I again face this problem. Please return my money