Lies and broken promises

I was promised by 2 agents I would not lose service, but I did. A payment arrangement was set up for me. I was told not to worry. They still turned it off. Today I was told that my service would be restored in an hour. It wasn't. Niw I sm being told I have to pay my past due to be turned on snd I am not eligible for a payment arrangement.  How can an agent set up a payment arrangement for me and promise I wont lose service and yet U still lost service! I have it all in writing from the chat. Seems illegal.  After they set up my arrangement they proceeded to try to get me to get cell phone service. That us annoying as well. How can I trust a company that promises I wont lise service. Uses my bank card to set up a payment  and then turned me off?? It isn't right!