As an HR expert, I understand your concerns regarding the methods used by your colleagues to gain a salary increase. While it may seem unfair that they are rewarded for such behavior, it is important to keep in mind that managers may not be aware of the hard work and achievements of their employees. I would recommend that you schedule a one-on-one meeting with your manager and discuss your contributions to the company and the value you bring to the team. This will give you the opportunity to highlight your achievements and request a salary increase based on your performance. Remember, it is important to communicate effectively and professionally in order to achieve your goals.