been calling Where’s My Refund for several weeks

I been calling the Where’s My Refund for several weeks. Calling 800-829-1040 or 800-829-1954. I filled & mailed our Senior form (married-joint) approx May 26th, 2020. Always the system tells me information is Not available. Mailed the tax forms from Mandan ND to Egden, Utah. I’m afraid the postal service could of Lost our envelope. I know with this Virus your employees are in short numbers. Please advise me what I should do besides waiting. I call the Where’s My Refund weekly and check my checking account for our refund. Thank you & Stay Safe.