Hyundai Finance Failed to return $29,555.00 that they agreed they owed me in November 2021. Fountain Valley CA

I obtained a lease from Hyundai Finance (HF) 5/21.  In 11/21 I decided I wanted to pay off the lease so I obtained a loan from USAA in the amount of $29,555.  When I called HF to get the payoff on the lease they did not tell me that the check had to come from the dealer since I was in Colorado. 

When USAA mailed the check to HF, they (HF) realized they couldn't accept it but they cashed it anyway.  Since that time (11/22/21) I have been trying to get them to return the check to USAA.  Since then, I have been paying a payment to HF and one to USAA each month. 

HF is extremely difficult to work with.  They have ordered 3 checks (cancelling the previous one when I requested it after a significant amount of time). 

There is a disconnect between Customer Service and Payment Processing and the 1st 3 checks were mailed in regular mail (even though I gave them my FedEx account to use) but apparently not to the right address and/or not with my USAA account number on the check so that USAA knew what to do with the check. 

None of the 3 has reached USAA.  The 4th check was requested back in March and Customer Service tells me it still hasn't been sent.

At this point I'm assuming that HF intends to keep my $29, 555.  I have spent more than $2000 in extra payments and more than $300 in interest to USAA.  I have spoken with the Finance Manager at McDconald Huyndai in Denver (John O'Hanlon) and he has reached out to try to get it resolved with no success.

HF customer service seems to be asking for the right information that I've told them needs to be on the check or in the address but their system seems to be such that they have no conversation with Payment Processing.  I hit a brick wall several months ago and need assistance.