Synchrony Financial Credit Card Complaint

Synchrony Financial Credit card department,

Payoff process Oklahoma

I sent certified funds via certified mail to Synchrony Bank/Sam 's Club to pay off this account in -, 2015. It was signed for on - -, 2015 and can be verified at usps.gov. I have the tracking number. I have copies of the returned certified mail receipt that was signed by their representative. They lost the check and have added another months interest as well as a late charge. I have contacted them four times and get a run-around and an attitude that I 'm a deadbeat or am simply ignored. They are n't even offering the courtesy of a phone call, email or any form of update as to what, if anything, they are trying to do to remedy my issue.