Iphone 12 Pro Max Antenna Issues

I have an Apple iPhone-12 Pro Max 3 years old Will not connect to cellular service. When I took it in for repair I was told that the antenna was broken & it would have to be sent away for repair, leaving me without a phone for a unspecified period and that Apple would not warranty it even though the Antennas breaking have been an Apple Issue for a long time I now have to buy a new phone