I bought game a few years ago. I performed factory reset on android tablet because it was slow. Installed game after some time. Now I see ads. But I paid for that app? What can I do to get add free version? Or can I get refund?
Their might have been an ad supported version released after you purchased the Paid version, Usually looking through your purchased apps on the PlayStore you'll find the Paid version to download again. I use My Paid Apps on Google Play to reinstall any of my purchases.
Follow these steps
Contact the app developer if they are not able to resolve your problem follow other steps.
Use Net Guard app or any other network blocker app to block that app's internet access.
Use LuckyPatcher and remove google ads package (before you try this step I tell you in 3 option google-play-store give you warning to remove the lucky patcher app). Try 3 option at your own risk.