At the beginning of October, I enroll in a course ...

At the beginning of October, I enroll in a course that would have had to start on the 18th and I pay.
On the 10th they tell me that they are changing the start date to January, so I kindly ask for a refund to allow me to pay for another solution, since I had to start the course right away.
on the 28th they still haven't returned my money and I have lost the opportunity to start another course (in another school obviously) in October, although I had explained my urgency to them.
They asked for my money right away (370 euros), but "refunds only at the end of the month". It seems to me the most disrespectful.
also to see if they will ever return what I have paid.