Do you remember sharing your wi-fi password with your neighbours? If yes or even in doubt, change your wi-fi password, its easy, if you are not able to, call ooredoo, the time it take to connect to ooredoo is horrible, but once on line, the guys are professional and they will guide you step by step to change your password.
If you have never given out your password to them, then you may be thinking wrong, they are not using your wi-fi... and relax.