Bluetooth Module

I like Mazda vehicles so much I drive an hour just to get it serviced at the closest dealership. The Bluetooth feature stopped working and my husband drove an hour to have it repaired, and I even spoke to the Service Department so he understood that the pairing option cut off in different parts on the option so I knew it was not my phone. After diagnostic testing my husband was told they were able to pair their phones and that the problem was my iPhone. They did not try to pair my husband's phone. So, later on we drove another hour to get this resolved. This time they told me the Bluetooth module was bad and it would cost close to $700 to replace the module. I consider this to be outrageous. I do not consider my car that old for this feature to go bad. Can you help with this?