what should i do if i get a pre litigation letter

have received a pre litigation notice from an attorney for writing a review for a service I didn’t like. The service was for marketing. I wrote in the review it can take 6 to 8 months to get sales. I wrote this based my experience and what has been suggested by their manager. At first the attorney sent me a cease and desist letter suggesting that what I wrote was false statement. I have sent him an email stating what I wrote was based on the information from their marketing manager. He replied with the threat that he will move forward with the litigation if I don’t remove the review immediately. I have never replied to that email as it didn’t make any sense and I was already stressed out about all the money .A couple of days ago I received a pre litigation notice that they are requesting a judge to enter litigation in Hillsborough county Florida . I don’t know why he picked that county. I live in Houston and none of the company address the attorney listed of the company are located