After you file

I'm having an issue with applying for a payment plan. When I plugged in all my info I got this message:

 

Online Payment Agreement (OPA)


We are unable to complete the transaction you requested.

Please Contact the IRS


Please call [phone number removed] ext. 684 for further assistance.

When I called the wait was about an hour and I never got thru.  I will be trying again today.

I have a few questions:

1. On my amended return it says: "The following return has been transmitted". But it won't let me click "File amended return" without saying how I will pay the taxes. Did my amended return get filed, or can I request an extension until the payment issue is resolved?

2. Any idea what the issue could be with the payment plan?

Any help would be greatly appreciated.