Two Month Waiting Period!!!

So I’ve been waiting for my car for 2 Months now. It took 3 weeks for my insurance to authorize the claim. There after I’ve been following my service provider around , I had to call Mazda SA myself to find out what is happening with the parts. My parts arrived and I haven’t had any feedback since Tuesday. I’m exhausted with following them around. My fiancé called them and they didn’t respond. Everytime I call my provider is “busy with a client” and he responds 2 days later. This is extremely frustrating considering they’re able to travel to work daily. I’m a healthcare provider and it’s frustrating for me to not be mobile for this long. I’m not sure if it’s incompetence or backlog of work. Their communication with clientele is the worst ; it’s as if they’re doing you a favor.