I bought a retail business and my friend who is on a visitor visa requested me to accept some of his investment and put him as a sleeping partner so that it could help him to obtain some sort of a permanent residency visa. After a year, the business faced a huge loss and with his agreeing I sold the business while his visa application was in process. His visa application was refused and he became so angry with me obviously for no reason. He then filed a case against me for selling business without his permission which is absolutely not true. Before selling the business, he signed paperwork agreeing for the sale but now he denies it even though I have the paper work with me which was done through a professional licensed company. What can I do now under Commercial Law? I am so much under tension.