If a contractor did not install my garage door properly and refused to fix it as per the warranty, what are my options?

Question Details: Garage door opener installer failed to fix improperly installed door. It was shaking vigourously during operation. I contacted him within 24 hours and asked him to fix the problem as the item was under warranty. He refused to fix and asked me to pay $75 for service charges and I told him that it is under warranty. He quit responding and I called credit card co and cancelled his charges. I asked another contractor to install new opener. I told the previous contractor that he can take his equipment back. He is threatening to sue me?

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