Find business principle by life_01

A story happen on myself.

Some days ago , i want to find good workers to decorate my new house. A : the worker is introduced by my friends. B: the worker we meet around my house C: the worker who come to find us the price is A>B=C(C is very clever ,he said, i will give you the price better than B) Professionalism: C>A>B Then we want to choose C. cause C is professional and good price , what's more, He gave a good idea to decorate my house . BUT......................... when we have a date that C came to decorate, at 7:30am. He said he will come at 8:30. OK. we wait. when times at date time. he said he need to add price!!! Excuse me? He said his worker complain the price is too low.  Then i dont want to say anymore, and choose A to decorate.  I want to say: sometimes price and professionalism is important . but no matter when . we need to be as good as his word. then the customer will trust us.