Based on employment laws and regulations, it is important to have a written employment contract or offer letter stating the terms and conditions of your employment. However, if you have been working for almost 2 years without signing any offer letter, it can be assumed that you have an implied contract with your employer. In this case, it is recommended to consult with a legal professional to understand your rights and obligations as an employee. Regardless of the absence of an offer letter, it is advisable to provide a reasonable notice period when resigning. A notice period of 24 hours may not be considered sufficient in most cases, as companies typically require a longer notice period to ensure proper transition and handover of responsibilities. It is recommended to refer to any policies or procedures established by your employer regarding resignation and notice periods. It is also advisable to communicate your concerns regarding the rude behavior of the staff to your employer or the human resources department, as they may be able to address the issue and improve the working environment for everyone.