The IRS says they send refunds in 21 days for 9 out of 10 efiled returns. The date is an estimate, an educated guess, a rough idea. In other words, it should not be relied on. The IRS can not say how long that other 1 of the 10 will take. All you can do now is, wait. Wait for the pay off of your interest free loan to the government. Have you thought of paying just enough by estimates or withholding to avoid a penalty and let the government wait for your check?
Check out
https://www.irs.gov/wheres-my-refund