Not giving the profit to the shareholders

Q: If you had given someone a sum of money to invest in a property but they are now constantly making excuses not to give the money or the profit to you (but you don't know their situation - maybe they are struggling) would that be considered as just a debt or stealing? Does it make their income haraam? For instance, if they are hosting a function, would it be permissible to attend and partake of the food?