Who I have the same questioned this topic

I have been dealing with a trade-in problem since January 2023. I returned the iPhone for trade-in credit in December of 2022. I returned the phone nearly as soon as I received the  trade-in box from Verizon because I didn't want to put the promotional credit in danger. Verizon representatives have a record of this, and I have been told that I should receive $22 back on each bill. 

Early on, I called about not receiving an update about the return even though Verizon had a record of receipt of the phone and I had a UPS tracking number proving the phone was received. Since February, I have been on chats because of time wasted on the phone.

I have been told every month that I would receive this credit. Some months I have been on chat two times.  Once, I was credited about $125 because of the problem; however, my bill has not changed to reflect the credit since although I was promised it would.

On July 5, 2023, I was last on a chat, and I requested an email as evidence from Verizon  stating how often I have been on chat dealing with this only to have nothing done about my problem. In that email I was told that the promotional credit would be added to my account on July 17. I was told that I needed to have faith in Verizon. Well, of course, nothing has been changed on my account despite another promise and email evidence.

Verizon has my returned iPhone, and they refuse to correct this problem. I am now keeping track of all of the hours I have spent dealing with this.

I am now on a chat again. I just explained the problem to one person. I got no response after typing out the issue. Now, another person has jumped on asking me what my problem is. I then asked what was going on.  

Why is this so difficult to correct? How can any company treat someone like this?