After reading all the replies, it seems coinbase is the only one who can refund you back so just wait for their response it will take a while to get. Coinbase is such a big crypto trading platform so they will handle support tickets on a queue based as most platforms do so you don't blame for their late response you may have to consider these things before.
Thanks, the problem here is that they dont response... I just get automatic response...
Don't lose your hope, still you have chances but be patient until the real staff from coinbase contact you via email, you can also contact them via telephone number which is available on their official contact us page.