Cafe Coffee Day — Cake was overcharged

Address:

Bangalore, Karnataka, 560033

I purchased a box of 'hazelnut karat cake-butter cream' from ccd banaswadi bangalore branch. The mrp on the box clearly shows "mrp rs. 625.00 incl. Of all taxes". However the billed amount was rs.660 (Price rs.549 + [protected]@14.5% rs.79.61 + service tax @5.6% 30.74 + sb cess @0.20% rs.1.10).
My first question is why i am being billed rs.660, when the price clearly is 625 inclusive of all taxes.
Secondly, what is this new price (Rs.549) that banaswadi branch is quoting. Lastly, why am i supposed to pay service tax when i am purchasing a frozen and packed cake.
I have the cake box and the bill saved for reference.I need my refund immediately, else i will have to move to consumer court for legal action.