Maybe I would chase the demanding customer is the purchase is very substantial that is like 1/4 of our daily sales. But for a demanding customer with an ordinary purchase every time then it is best to just let him go to other shops. You have to keep your sanity with those kind of people. They will ruin your day.Sometimes you might be left with no other choice after exhausting all your options than to resort to pursuing your customers when they are too demanding. Some customers are violent and aggressive in their demands. When you protects your brand, it is also good to protect your life from violent customers.