I didn’t receive anything in the mail. Who do I contact for my return to be sent to me?
How do you know the mail carrier sent your refund back to the sender? If that happened, you contact the sender. TurboTax has no way to help with that.
If you mean the refund check that the IRS mailed then you can call the IRS toll-free at 800-829-1040, M - F, 7 a.m. - 7 p.m.