Air Bag Light On problems of the 2007 Audi A4

Received airbag recall NHTSA 16v079 on April 2016. After almost 3 years of waiting for parts due to shortage the airbag was replaced on February 2019. On April 2019 airbag light came on. Dealer scanned vehicle and said was unrelated to the airbag which it was just replaced and wanted to charge me over $800 for a rear seatbelt tensioner. I didn't think they were being honest so I took the car to another non-Audi dealer and they confirmed the airbag codes were related to actual airbag which was replaced. After a lot of back and forth and aggravation with Audi, they decided to replace the airbag a second time on may of 2020 and airbag light went away. However, 5 months later on October of 2020 airbag light came back on. Dealer now says the airbag control module is not good and wants to charge me $2,800 plus taxes to replace it. I feel they don't know what is causing the problem and are presenting me with a fat bill with the hopes I will walk away without repairing, this way they are off the hook from any obligations to repair the car or potential law suits in case of an accident. I am running out of options at this point. I feel the dealer and manufacture are not taking responsibility to repair an issue which started after the airbag recall replacement and now they want to charge me $3,000 for something I am not even sure it will work. Is there a law that would protect the consumer from this type of situation? after all this was a recall. . . . . What is my right at this point?.

Takata recall. The contact owns a 2007 Audi A4. When the contact started the vehicle, the air bag warning indicator illuminated intermittently. The contact received notification of NHTSA campaign number: 16v385000 (air bags); however, the part needed to perform the repair was unavailable. The manufacturer was not notified of the failure. The approximate failure mileage was 95,000. VIN tool confirms parts not available.