Lied to and billed for a phone that I was offered for free

In February this year, I switched from Verizon to T-mobile. I was happy with verizon, but they weren't offering as good as a promotion as T-mobile was, and since I was 19 & switching off my dads plan, I wanted the best deal. I was unaware of how awful this company really was at that time. They told me that if I traded in my phone I'd get $800 off the iPhone 13 & I could throw an Apple Watch SE in for only $200. I asked the lady on the phone if this was a credit situation or if it would be instantly applied. I wanted to have the option to pay off the devices at any time without losing my promotion. She assured me that I could pay them off at anytime, and the promotion would instantly apply to my account, not a credit situation. I never really checked on that until a few weeks ago when I realized it said I owed $219 on my watch I was told was $200. Come to find out the rep that sold me my devices, LIED about it all. I ended up switching back to Verizon because I don't want to support a company that misleads its customers. When I contacted them over the app to get my phone # transfer pin, they told me due to "privacy" reasons they couldn't do it over the app. So I called, and was told they only do it over the app. I had to ask to speak to 3 different supervisors before someone was able to finally get me a pin. It was frankly embarrassing for them. Ever since having these issues, I'm suddenly unable to access my app, contact customer support through the app (when it will allow access), or anything. I'm so thankful I was able to switch over back to Verizon. After arguing with them on the app, they stopped using punctuation, capitalizing letters, and misspelling words. They were begging me to stay, even after telling me that they couldn't help me at all about any of my issues.z 

HEAD MY WARNING: if you're thinking of switching please don't. Every Verizon rep I spoke to told me that this was typical, and they see it everyday. This was after I switched back so they had no reason to sway my opinion. I've seen so many posts & videos online about other people having similar or very very worse issues. You're better off using any other company.