Dominos Pizza — Charing of dual taxes

Address:

Vadodara, Gujarat, 390019

I had been to Dominos Pizza at InOrbit mall, Vadodara, Gujarat and when they told me that they charge 20.8% tax which includes VAT and service tax both. I am not in the favour of paying service tax as they provided me material and not service. I know there are things on which government has allowed to charge dual taxes but I am not convinced here. Also to my surprise next counter which also sells similar product charged only single tax. So either of them is wrong. Also when questioned to staff of Dominos why they charge dual tax, they told me to enquie on TIN no provided on invoice, how can anyone enquire about taxes they charge from TIN no.? I have invoice copies of both counter. Can anyone help me for procedure to enquire, who is charging on correct manner.