Need help with payment arrangment disaster

Set a payment arrangement for 3/19 for past due balance.  Received new information and needed to adjust agreement.  Website directed me to Xfinity Assistant which opened a payment arrangement page.  I thought I adjusted it for full account balance by April 4 (The last day allowable to keep service).  When finished I found that it created a second payment arrangement.  I cancelled the new one and restarted the process. This updated the agreement as I needed.  Full account balance on April 4.  Awoke today 3/20 to suspended service.  4 chat session 4 phone calls. I have been told it can't be fixed unless I pay past due now. Then told it was fixed for 4/4 full balance and restoration should be in 1-2hours.  3 hours later no service.  Again told it can't be fixed.  Then sent to customer loyalty who sent a refresh and things came on.  A few minutes ago I get a message my arrangement was updated to past due by tomorrow 3/21.  Very frustrated.  Ready to leave.  Treated poorly by some reps blaming the entire issue on me.  Ready to file BBB and FCC complaints.  Someone please help!  Been here almost 10 yrs.  Almost 20k in internet fees paid.