Dear (Name of the person),
I was so happy to get your offer letter yesterday but unfortunately, I decided not to accept this offer because the salary which you have stated in it was far too less for me. I am not comfortable working with this pay scale. My current salary is dollar X per month but you are offering me less than that. Also, I have experience of 5 years in the same field so how could I get agree to accept such a proposal. I am sorry to tell you but I cannot join in such conditions.
I am the only working person in my family. I am the only one who earns the bread for my family members, that is why at any cost I cannot cope up with you. It is against my dignity to go for a lesser salary than what I earn today. The name and fame of the institution do not matter. Sometimes we also have to look for the salary, especially in cases like mine.
It was really not expected from such a renowned institution that they will offer such a low salary to the employees who are well educated and experienced. I hope that you will forward this offer letter to anybody else who is in greater need than me. I am absolutely satisfied with my present job and its salary. Also, I can get bonuses from them for my extra work. Thank you again for offering me this opportunity to work with you.