We had to submit additional information on our federal return, we returned but still haven't received our federal return.

[2007blueoval]

we had to submit form 8289, sent by mail over 8 weeks ago, haven't received any refund.

[Texas Roger]

The IRS is currently not processing any paperwork. It's not clear exactly when they stopped but it may have been before they received the form you sent.

TurboTax gets no information about the status of your refund.
In normal times, the IRS says that most filers get their refunds within 21 days from the time their tax return is accepted.
Many returns are taking longer now since the IRS did not process returns for a while and there is now a big backlog of unprocessed returns.
The IRS is currently not processing any mailed returns and is not taking any phone calls.

If you efiled your return, have you confirmed that the return was submitted by TurboTax and accepted by the IRS?
https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp

If accepted, what does the IRS tracking web site say about the status of your refund?
https://www.irs.gov/refunds

Here is an IRS Q&A with information about refunds:
https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions