Xfinity mobile is terrible

I had offered a phone and started a plan because they promised me a certain number.   After getting the phone it turned out they couldn't give the number I needed/wanted so I returned the phone.   Not only did they charge me a restocking fee they continued to charge be for service I never had.   Never got assigned a number.   Not a second of air time used or a text sent.   When you call customer service you can't get anyone,  when you do it's a transfer game.  No matter how many calls or how many times you scream at these people they still continued to charge me.   They eventually gave me a credit that they used against past due service that I never used that was on going because every time I'm told the account was closed it wasn't.   Eventually I was sent to collections ...... F@&king COLLECTIONS for $3.  Save yourself,  run from these people.   I lost hundreds of dollars for nothing