Registration - Goods and Services Tax - GST

One rice mill owner has obtained registration of the office premises from where they just billing but has not added the rice mill premises as principal place of business in his registration application. Now he argue that he has already mentioned both the address on his letter pad and they need not to add the address of rice mill as principal place of business. However the tax officer during verification found that no rice mill exist at the registered address hence cancelled the registration. What should the tax payer do.