Keeping a good name is difficult but no without solutions. The key point of your running business is costumers. They hold the power over your company's good name or reputation. They also may direct where your business headed to. So, by treating them wisely you'll be able to maintain your good reputation. One of millions way to realize it is by giving the best service for your customers.
Firstly, customers who buy your products are equal so don't treat them differently. Assist them with more individual attentions. Secondly, good service is as effective as selling product. Keep in mind that service represents the capability and professionalism of your company. Next, it is normal when you are desperately difficult to find a solution to the problem you customer suffered from.