Udemy — payment made, but course not received

I purchased a course on udemy for rs 399 of which the payment was made, but i didn't receive the course.
I have the receipt of the payment made as well.
My bank account summary shows that the amount was debited from my account, but i haven't received the course.
This is the link of the course that i purchased.
https://www.udemy.com/course/microsoft-excel-2013-from-beginner-to-advanced-and-...⇄

Kindly look into the matter.