Psychologically, it is always better to know the best ways to handle clients that do complain about their past freelancers should be learnt. Not all clients are to be given attention. There are some that you need to run away from. You are doing this for your mental health. When a client complains too much about their past freelancers, they are always using psychology for the freelancers not to collect more money from them. What do you think about this?