Synchrony Bank Bank Account Or Service Complaint

Synchrony Bank Bank account or service department,

Checking account Account opening, closing, or management New York

I received a phone call at - from - at - - regarding my dispute with - - - for $2900.00. He stated that due to my signing a - - with - - - in which they were supposed to reimburse me $2900.00 via certified which I never received they could not help me. Please be advised I did not receive the monies specified. Which has brought me to this point. My credit card company states they will not refund my money, I actually sent them documented proof that I did not receive the checks. In their responses they provided a contract which I admitted to signing and checks that have never been cashed, which proves nothing. Please advise my credit card company under the Federal Truth in Lending Act ( TILA ) and Regulation Z, I have ONE YEAR to file a non-billing error type dispute. Every other credit card and debit card holder has refunded my money. This is simply a claim of service not as described which can still be disputed. Please help me advise the credit card company they should open the investigation and issue a credit.