Call sales, not support and explain your position. Follow up with an email to the person you speak to outlining the timeline of events so far. Include an accurate statement that summarizes how long you've been without your headphones since you sent them for repair. In this email, ask, succinctly, if they believe this is a reasonable/typical period to repair/replace a headphone. (If the unit in question is genuinely available for immediate purchase and delivery either from Audeze or from a dealer then there is no good reason for a repair/replacement to take an unusually long time.) Additionally, ask for a specific date when you can expect them to ship your repaired/replaced unit. Keep emotion out of the email. Stick to facts. And keep a copy of the email - either from via sent-folder or via CC'ing it to yourself. If you don't get a resolution in a reasonable period (a day or two for a solid answer, a week to get a shipping notice), contact a lawyer and have them draft a formal letter on the matter (I very much doubt this will be necessary).