Payment Arrangement Not Being Honored

I hate posting this here. I have spoken with over 7 representatives and 3 chat reps. I was offered a payment arrangement in chat twice.  Customer service refuses to honor it. I don't understand this. I keep getting promises to receive assistance without true support. 

This instance started on Monday. I called in.  A representative told me to pay a certain amount to get an extension on my agreement. When I paid he then back peddled and said it may need to be escalated to a different department. 

Once I spoke with this department they insisted he gave false information and Nothing could be done. 

I called back and someone said they could help. They spoke with their supervisor. The supervisor provided me an extension until the following week per what the CS rep told me. It wasn't updated in the app. I called to verify I was told the incorrect information was shared. 

At this point I am internally hysterical. I remain calm. I call again. A gentleman stated he couldn't change it but to speak with the chat representative in the app. They provided an immediate solution. I downloaded the transcript and screenshot the conversation. 

I spoke with CS to confirm because again it did not update in the app. They stated again I received wrong information. This is after I was told to get help from a chat representative. 

My service is utterly important as I work from home. Can someone provide a recommendation on keeping my service active and having my arrangement honored. Lying and so forth is really disheartening as a customer. Thanks