T mobile I was scammed and treated like crap Bellvue Washington

My son had a T mobile plan and all 4 of us were on it. He decided to go to Sprint and left us hanging. I went to t mobile and explained what happened. They store manager said no problem and gave us a new account in my husband's name and told us the balance of all 3 phones would be transferred to the new account. Fast forward 3 months I was paying the bill every month and kept calling about the balance transfer. They said it can take a couple of months. The next day we had no service and all 3 phones were blocked. I called and got the run around. Told me I had to pay the phones off in full before I could have service back. I paid them off and they unblocked them but then said I owed 3 months of service. I contacted the FCC and filed a complaint. Corporate called and apologized. So end of story wrong! Fast forward to yesterday. My phones phone broke. So I took one of the old phones that I paid off last year and put the SIM card in it. Wouldn't work. So I called them. They said it was active and would have service in 3 hours. Still no service today. I call and they tell me the phone is blocked for non payment, WTF. Shee says you will have to pay for the phone $300. It was a $ 149 when I bought it 3 years ago. I told her no. She started making fun of me talking to me like I was a 2 year old. Demanded a supervisor. He gets on the phone talking down to me telling me to pay my bill. I don't owe you anything. He started talking to me in a condensing manner through his Indian accent. I said that's it I am going to another carrier if you won't fix this. He demanded money I hung up on him. He turned my service off. Service I just paid for. I am going to see if I can get a class action started