If you are looking to get a refund for a purchase made on your iOS device, you need to contact Apple. They will be the ones handling this process for you.
If you prefer to look through some steps before contacting an advisor, take a look at Apple's self help article here.
In most cases, you will have to contact the iTunes department directly. If you want an Apple advisor to guide you through the process over the phone, you can find the appropriate number to dial here! Make sure you select the correct country so you can get the correct contact information.
If you prefer to contact iTunes in another way, you'll have to go here. Again, make sure you select the correct country.
As we don't have access to Apple's payment systems, we are unable to manually process a refund for you. Please keep this in mind if you decide to contact our Player Experience Team.