When will I get my amended refund, its 20 weeks on September 1.

The 20 weeks shown on the IRS is just an average processing time for an amended tax return.  It can take and in many cases does take longer than 20 weeks.

You can trying call the IRS but more than likely they will not have any further information other than what is posted on the IRS amended return status website - https://www.irs.gov/filing/wheres-my-amended-return

Call the IRS: 1-800-829-1040 hours 7 AM - 7 PM local time Monday-Friday
When calling the IRS do NOT choose the first option re: "Refund", or it will send you to an automated phone line.
So after first choosing your language, then do NOT choose Option 1 (refund info). Choose option 2 for "personal income tax" instead.
Then press 1 for "form, tax history, or payment".
Then press 3 "for all other questions."
Then press 2 "for all other questions."
- When it asks you to enter your SSN or EIN to access your account information, don't enter anything.
- After it asks twice, you will get another menu.

Press 2 for personal or individual tax questions.
Then press 3 for all other inquiries
It should then transfer you to an agent.