ADT Security Services review: Customer service after being switched from Alder to ADT

I've been an Alder customer for several years. In July 2024, I received an email from ADT (not Alder) stating that my account had been switched to ADT, and that I should no longer call Alder regarding my account or any technical issues. I had chosen Alder after research, and specifically did not choose ADT, so I was shocked when my account was moved to ADT without my approval. Fast forward to December 2025, when I had to call ADT for technical support. One of my sensors kept sending an error code to my panel, so a technician was dispatched to my house on Christmas Eve. After he worked on my sensor, he asked if there was anything else he needed to look at, so I showed him that one of my cameras had quit working. He determined the camera had died, and removed it from the outside corner of my house so he could find a replacement. He came back 2 more times to try to fix the issue, and was not able to get his ADT camera to work with the Alder system that I have. He said that basically the only thing he knew to do was to replace my entire system, which would be at my expense. I stated that that wasn't fair since I was still paying on that system, and I didn't want to have to pay for an entirely new system when only one camera wasn't working. I ended up calling ADT customer support yesterday 1/20/25. After being on the phone for hours, being passed from one person to the next, I was finally sent to an account manager. I explained my situation, that I was an Alder customer that was now and ADT customer, and that the technician couldn't get the ADT camera to work with my system. And I explained that I had been transferred to "add on" department who told me that a new system was the best option, and that it would cost me over $1,800 (plus I'd have to pay out my existing contract on the existing equipment). I explained that this wasn't fair to me, because I was forced into this relationship, and they should be able to fix this equipment. The account manager replied that they were also forced into it, and was very rude to me. All I wanted was some help getting either the camera taken care of, or my account discounted since I'm paying for a camera that doesn't work. She said that upgrading would resolve that, but again it would be at my expense. She also offered to send out a different technician, with a Google camera, at a cost of $150, but it would not tie to my existing system. And I would still be paying for the camera that doesn't work. The technician took the camera with him, so I now have a hole in my soffit where the camera used to be. ADT was unwilling to budge, and basically blamed the situation on their technician.
I asked if I could get out of my contract, and she said that I could if I bought it out. I signed my contract with Alder, not ADT. I chose Alder, not ADT. But I'm stuck with ADT.