Wrong Delivery

Good day I purchased a Mac book from the I STORE ONLINE. I received it 19 th June . IT WAS THE WRONG ITEM DELIVERY WAS HEADPHONES I WAS HORRIFIED COMPARE THE PRICE I PAID FOR MY MAC BOOK. The headphones were picked up the next day. I sent emails about my REFUND IM STILL WAITING. I NEED MY CÀSH BECAUSE I NEED TO BY MACBOOK FOR OFFICE DUTIES. I need to know how long I still need to wait? VERY.BAD SERVICE NIT AGAIN