⚠Important: Please always log into your account the same way you created it. 
iOS users:
1. Please try the “Restore Purchase” button on the pricing page.
2. If “Restore Purchase” doesn’t work, please check if you have logged into the Apple ID with which you bought the membership. Because Restore Purchase won’t work if the Apple ID you’re in did not buy the in-app purchase item.
3. If you can’t still “Restore Purchase”, please offer us the receipt or the purchase record from iOS, and we’ll help activate your membership manually.
Android users:
Try logging out in ChineseSkill and back in.