Optical store did not gave store credit, or refund.

I made 3 pair of prescription glasses worth of $ 1400. my eye examination done on 5/14 and made my glasses 6/14. due to cataract i could not see properly, i went to return for refund or store credit ( as per sore policy they should give store credit). They did not gave any thing and said come after 60 days after surgery , we will make new one, but according to my doctor and procedure it takes more than 60 days and then i do not need glasses after surgery, i explained but he did not gave any thing back. Mean while I did dispute the charges with American Express Card but did not worked, He said 30 days for return credit.There is nothing like rule printed anywhere. I said i have contract with supplier to trick them every 60 days and get new one upto three times , we can accommodate you, But i do not have any time period for new prescription . he lied to me that i offer you store credit , you did take it. you wanted glasses but its not true. what is your advice on that matte