i recently got banned for posting and sending personal messages to my original account even i didn`t made anything wrong.
i'm confused a little bit, so are you saying that you message your other account? Why would you do even do that? It makes no sense at all

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what should i do ?
Is there any chance I'll be unlocked ?
The only thing you can do is to appeal or just forget that account and make a brand new start. If you will push the first one, I am not sure if you will be given a second chance by mods because first, you're guilty (whether it's just an accident or not) and second, you need first to present a strong reason why they will forgive you. I'm not discouraging you but decisions of mods' are final as usual.