Problem with Trade in credits

I am very disappointed in the AT&T Trade-In-Program.  I bought a new Galaxy S10 and mailed in my old Galaxy S7.  I received an email confirmation two months ago that my S7 was received and that my S7 was valued at $75.  I received another email a month later saying that my $75 promotional card was on it's way and would take approximately 3 weeks to arrive.  It is now four weeks since that email and I still have not received my promotional card.  I hope I get my $75 promotional card before I'm ready to trade in my new S10.  I sure don't wait 2 months to pay my AT&T bill.  I don't think I'll be using or recommending the AT&T Trade-In Program.