Promotional Trade-In Credit Never Applied to Account?

Such a scam. I got my phone March 2021. Suppose to pay $5/m for my phone but this still charge me $27. No…. I gave you my trade in. I still have to call EVERY SINGLE MONTH to make them fix my bill and it's the same run down "so sorry this won't happen again". I try to be so nice because it's not the reps fault - but I just tell them yes it will. Now I am so over I just don't pay my bill on time, turn off auto pay, and then make them give me like $80-100 in credits because I am so annoyed I can't call every month. 
 

After doing this so many times I told them I need out of the contract and I won't be paying the early termination fee because they have failed to properly bill me every month for 1.6 year. They agreed to it, but then I would loose the rest of my trade in credit and had to pay the rest of the phone off. I decided against it because they owe that to me…. plus their internet is the only service I get where I live. 
 

It sucks because I love the service/Internet…. want to get an Apple Watch… but not if they can't hold up their end of the agreement, month after month. I mean, in the beginning they even charged me for TWO phones!! I don't even have two phones. 
 

This is obviously a reoccurring/common scam and this should get on the news. They know what they are doing…….