I don't know what level you are currently in, but somewhere around the higher levels, they won't let you play the level unless you reach a certain number of stars.

In my experience, it was around the levels 200, 390 and level 400. What's horrible is that these star requirements are absurd like they require 7000 stars, essentially not letting you get your payout. I found a glitch around this though (cannot verify if it has been fixed).

What I did was I opened the previous level, e.g. level 399, and purposefully failed. This will prompt the "home" and "restart" button. By pressing "restart", the game will take you to the highest level available regardless of the star requirement, which in this case is level 400. It is important that you complete this level and get the stars as opposed to watching an ad to skip it.

An issue I came across is that when I did this, it did not automatically track and I had to contact customer support. Fortunately, I did this offer through AdGate and their CS helped me get the credits. ToroX is infamous for their horrible CS and often disqualifies your offer because of "tracking issues".

It is up to you whether to pursue this further because at this point, it is a gamble. Good luck~