Auto Service Agency Trying to enforce covereage St. Louis Mo

They sent me a letter talking about Platinum Coverage , I told them that I already have coverage through my insurance company . They insisted , I told them I couldn't afford any more coverage , they kept pushing . I hung up and didn't call back . They were trying to enforce the issue of me needing more coverage . They asked for money , I told them I'm on a fixed income . They kept lowering the price to get me to buy . I didn't give them any account information or any other personal information .