A possible way to revise this sentence so that it conveys clear, concise ideas and does not change its meaning is by changing the order of some clauses, making more direct and objective:
<em> I was sure that this was the right address. But after I rang the bell, I had to wait because no one came to the door. Then, I saw a curtain move.</em>
How the customer is advice. Who would provide infor the business might cater all need flexibility of products to be oferrred provide what the customer needs