No car, No update, No courtesy car

My Renault Megane went in for a Scheduled Service on the 18th of July 2014. I mentioned to them that my airbag light had gone on. They turned it off and I went with my car. Less than 2 months later the same warning light went on, so I took it back to them a while after, which happened to fall on my next service, 2015. I told them again, my airbag warning light is on. They then told me that they did not know what it was and to just ignore it. I then took my car for the scheduled service on the 13th of January 2016, they called me the next day and informed me that my airbags had been inactive for years and that they needed to order parts for the airbag computer system and that as soon as they received a part number, I would get my courtesy car. THE NIGHTMARE: They never proceeded to call me back. I've had to call back every day to find out about the progress on my vehicle and my courtesy car. I've been without my car, or a courtesy car for 2weeks now and still they do not call me back. I will never buy a Renault just because of this **** service, and inactive airbags.....unbelievable!!!! I'm still waiting for a call!