Barbeque Nation — not keeping committed price

Hi,
I made a booking yesterday night at 9:20 pm for 15th aug, in your kolkata park street branch. I was told about the buffet price as 830. I got a confirmation text at 9.25 pm.
However at 22.37 i got a text that the price has changed.
I called back the branch and argued that, when the booking was done - the price committed to me was rs830, if your price change notification has been issued after that, i should be entitled to the price committed to me.
I have called park street branch and also, informed the same to call centre person, who called me.
I am waiting for a callback from their side and maintain the commitment given to me and provide the expected customer service.
My back to back calls reply was - the manager is busy and he will call me back.
I may have the cancel this booking - but my experience with the company has turned sour.

Anvaya ganguly