I had given some amount to one of my friends as loan. Unfortunately I didnt ask him for a cheque or document, believing him. But he is not giving the money back. I have some sms from him that he sent at different times saying, please forgive for the delay, I will give you the money at some so and so date etc.. Can this be a valid proof for sending a legal notice to him? Or is there anything I can do for getting the money back?