I sent in $7300 for a payment and it was never cre...

I sent in $7300 for a payment and it was never credited. The company doesn't seem to care and takes no responsibility for cashing the check but not posting it. It's been over 45 days and nobody has reached out to me. I've called and sent letters. Also, they have never sent me a written statement of my account like I've asked them to do. Very shady company.