Can I lie to the customer?
What makes you think it's okay to lie to a customer?
Because I'm going to become the best service provider in this industry.
Successful companies are built on earning trust from their customers. Lying and especially getting caught in a lie, can destroy that trust.
They can be as good as they want, but I'm not going to gain any profit if I don't lie to them.
Don't you want to have a good reputation and see your customers happy with your services? I think that would be a more fulfilling lifestyle.