some people say the problem is not on the GAS, it's because the eth network is overloaded, and I tried using gas 30 keeps not working, but on transaction history in etherscan still pending, this confuses me, until when will be like this?
Yes, that is true, network is overloaded. Have you ever heard of game crypokitties?
They slowed down the whole network.
We could see the same issue like it is with bitcoin transactions lately.