Device credits

When i tried to have support activate my phone because it would not work through the app they activated my phone number to my wife's phone to fix this they canceled my line of service and activated a new one resulting in my monthly trade in credit being taken away. When I tried to fix this they then ended up canceling my other line of service and reactivated a new line resulting in my other monthly trade in credit being taken away. Now having fought with them for a few months with no results my phone bill is $100 dollars more than it should and the only things that have been done is a bogo phone line and I was offered a smartwatch which would lock me in for another 2 years of service. This is so incredibly wrong and I need to find out how to properly fix this. This company is actively stealing from me. Why will Noone do there job and help me?