Ecom Express — Address change

On 7th of April 2023 I ordered a set of books from Physics wallah so they couriered it through ecom express and assured that my books would arrive before 7th of may . On 2 may the message arrived from Ecom express that my package would be delivered on that particular day but it didn't came it happened a few times and they called me confirming my address because they thought my address might be wrong so I confirmed it correct but still it didn't arrive . Now the delevery date has passed and the status of my package on the tracker is delevery failure . Now I just want to change my address to an easier one