Hello, thank you for your feedback. We are sorry to hear about the difficulty you encountered installing your Maestro LED+ dimmer. This unit does require a re-wiring of the existing mechanical switch when used in a 3-way application, along with a simple programming procedure to ensure the Maestro dimmer is set to the correct mode for communicating to a 3-way switch. This is outlined in steps 6a and 9 in the following installation guide:
https://www.lutron.com/TechnicalDocumentLibrary/Replacing_a_dimmer_with_a_dimmer.pdf
Lutron does offer installation help at lutron.com/support with step-by-by step guides, videos and more. If you still have questions, please reach out to our support team at support@lutron.com, or call us at 1-844-LUTRON1. We're here 24/7, so please call us any time!