salary pending with the company

hi, i have worked with web designing company based in shahdara but the company didn't give me my pending salary , first the owner said that serve your notice period we will give you your whole salary and he also ask me that how much salary i have left with the company ,so i have given him a excel sheet which he accepted that time .But after that when i asked them they said me that they don't have funds right now when they have they will pay me .But when i call them again and again the owner of the company now saying that give the data backup of my work during the service period .but i don't have anything with me only one project data which i told him already and now its been more than 2 months since i left the company . i did everything what he told me to do . also he accepted my resignation and give me my experience letter .But now he is saying that according to the company rule he didn't find my work in his company computer so on advice of his CA he said me that we will not give my salary till i will not give him the data backup..during my service period he never gave my salary on time and even full. So now what can i do to get my salary back ...