I am addicted to masturbating. I don't know I try to control but can't. I know it's haraam and really want to get rid of this act. Can you please guide me on how to control and suggest me some duas.

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Indeed it’s haram. The reason is haram is that it may affect your marital relationship in future or you many end up not having a child.
There is no specific dua. However, I would advice you to prolong your sajda after salat by asking Allah to intervene on your behalf to be able to stop it.

Note that it triggers Allah’s punishment. So try as much as you can to stay from it. It requires your strong WILL POWER.