Synchrony Financial Credit Card Complaint

Synchrony Financial Credit card department,

Payoff process Texas

On - -, 2015 my bank sent out a check to Old Navy and paid the entire balance of $1300.00. The statement was sent from my bank and showed the check number, date cleared, etc ( it cleared on -/-/- ). Since the beginning of -, I 've been desperately trying to get this resolved! I 've been given the runaround by both Old Navy AND Sychrony Bank. It had even gone as far as them giving me phone numbers and fax numbers that do n't exist. I have tried faxing my bank statement showing the payment made over - times and have called about - times. Now, I 'm receiving a letter through mail that they are charging me late fees and sending me to collections for non-payment. Please help me! I 'm losing sleep over this because I do n't want my credit to be ruined.