According to the authors of:
First Break All the Rules:What the World’s Greatest Managers Do Differently
the 4 rules of thumbs for customer satisfaction on P128,  the first 2 rules are not going to get you any more than satisfied customers, that is having Accuracy and Availability.

But if you really want to get your converts and advocates for your company you are going to need the last 2 rules of thumb which are Partnership and Advice.

“Partnership and advice are the most advanced levels of customer expectation. If you consistently meet these expectations, you will have successfully transformed prospects into advocates”