INPUT ON MEETING EXPENSES - Goods and Services Tax - GST

I am a Practicing Chartered Accountant. Al we know that in the year 2017 is GST year. In the year 2017-18, I incurred a sum of Rs. 100000 towards meeting expenses to explain the GST Act to my customers and other Business Persons. Meeting was conducted by Auditors' forum and Other association. I incurred towards supply of Biscuits Confectionery Items which fall at 18% GST. In my GSTR, I have claimed this expenses as meeting expenses. Now the GST authority passed an order that this items fall in 17(5) of Foods Beverages. Hence Input amount should be reversed and pay tax. Kindly help me to file an appeal. Thanks in advance