You can fix either with little or no problem. But the failure to do so could be a mistake you might never overcome. Reputations are strange. They are difficult to build and easy to damage. That is why customer relations deserve careful attention.
Customer service is really the only way to go.
Customers depend on you, and you depend on them. Do your job right, and the customers will do right by you. Treat your customers as you would want to be treated yourself. It is an ancient rule, but it is also a golden rule for doing business. This site is best viewed at 800 x 600 resolution.