Can legal action be brought against me for solicitation of a company's customers?

Question Details: I work for a company for 22 years and the company sold to another company. I remembered customers' names and addresses that I have been in their homes doing service to their heating and air conditioning over the years, and I sent out letters informing them that if they would like to continue with my service that they could reach me at my new company which was not the company that bought the company that I previously worked for. I have since received a cease-and-desist letter from the owner of my previous company as well as the owner now has contacted my new company and is trying to cause problems for me. Both are threatening legal action against me.

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