Please let us know why you don't like it by writing us at support@piccollage.com 

As for the refund, please see the following steps and link for more reference.

How to get a refund using iPhone or iPad:

1. Launch Mail from your Home screen.

2. Search for "Your receipt from Apple." 

3. Find and tap on the receipt for the purchase you want refunded. 

4. Tap Report a Problem next to the purchase you want to get refunded. 

5. Enter your App ID and password

6. Tap Choose Problem and select a problem from the menu. 

7. Enter details for the problem and tap Submit. 

For refund on other devices, please check out the website  for more reference.