Yamaha — not replacing manufacturing defective guitar

Website:

in.yamaha.com/index.html

Hello, i bought acoustic guitar yamaha f310 from a local dealer, later a found a manufacturing defect in the guitar. I complained about the issue to dealer within warranty period and he told me that it will be replaced. Dealer also told me that he has replaced the three guitars last year of this model (Yamaha f310) with the same issue that i have. I was regularly contacting to the dealer about the guitar replacement, now it has been ~45 days and dealer said that "you should call at company contact and ask abount the case, i didn't get satisfactory reply from the dealer then i discussed the issue at the contact number of company, and they refused to replace it.
Please help