It's nothing personal - don't take offense... So your customers just don't want to talk to you anymore. No, they're not breaking up with you - they just don't like talking that much. So how do you do business with someone who doesn't want to talk?
A business without an internet presence in the 21st century is devastating. Word of mouth and referrals can only reach a limited number of people. Potential customers also no longer use the phone book to search for a business. They use search engines to get information about businesses that provide products and services they need. If you have no website to tell your story, they will not find you.