Why have a “cancel service plan” button if I can’t do it online and have to call anyway?

Is there a way to close an account without talking to retention?  The reason I’m leaving is because of poor customer service and forcing customers to talk to retention just makes already frustrated customers more frustrated. 

In my case I have already ported my numbers away and just want to close the account.  Related to that I have some questions.  If I’m closing the account why can’t representatives give me a final total balance (current and any past due amounts combined) to make the process as smooth as possible?  The rep I talked to said she could only tell me what my past due balance was for one month and not the total due.  Seems odd if I’m closing the account to not be able to generate a final amount due.  Doesn’t the forcing people to call violate the FTC’s “Click-to-Cancel” rule?  Is there a way to find the total amount due in the billing portal?