Wrong billing of account / Food not up to standard

We went for a lunch buffet in November 2014. The food was not up to standard and we were charged for a dinner buffet. Ever since I am trying to get a refund on this, but with no response to date! Send emails to various people and phoned, but it seems like it's just a don't care policy. I think I spoke to everyone all ready working there and apparently my emails were sent to the owner as well, but yet no response. Surely this is not good for business. Surely I would never visit you again!!