I would say to try and call again. I called and the hold time was kind of crappy but I got a tech and spent about 5 minutes with him before he agreed with my diagnosis of the issue and dispatched a part. I also emailed a question about diff brain settings and had a response within the hour. I replied to that response after business hours and had a reply to my email this morning. I think there is a breakdown in communication that is perceived as bad service. If you want something, you have to be like a dog who wants a bone. If they don't call back when they promise, call them. If they don't answer an email in 48 hours, call them. NEVER leave a message. Stay in the cue until you speak to a TECH. The lady who answers the phone is nice but I left a message with her once and that call was never returned. You have to be in command of your own destiny if you want your warranty honored. Ford won't fix my truck for free if I don't tell them what's wrong and drive it to their dealership even if it's a huge pain in my ass to do so.
Most importantly, be nice when you finally get someone on the line that can help you. Explain what has happened and all you've gone through to finally get to them but don't take it out on them. There are degrees of helpfulness they can offer. Nice people get level 10, jerk faces get level 1. That's not Arrma, that's the whole world.