Stand taken by your service provider is not correct.This is not the intention of Govt. to deny exemption from GST on the ground of word, "OR" used. By using the word, "OR" in the Notification No.21/2019-CT (Rate) dated 30.9.19 you have got more 'freedom'. Had the word,"AND' been used in the said notification, then the plea taken by your service provider would have been correct. In that situation you would have been bound by the word, "AND". The "OR" does not snatch freedom (exemption) from you.Per contra, "OR" helps you rather than chaining your service. Notification says 9967 (Storage and warehousing services) or 9985 (Support Services). Any kind of support service in maintaining warehouse is also exempted for storage of jaggery. Warehousing is a wider term and it includes storage also.For availing exemption you have choices.
99672 Storage and warehousing services
996729 Other storage and warehousing services
This service code includes storage services of grains, other storage or warehousing services.
In Service Tax era, this service was also specified as "Storage AND warehousing Service" under Section 65(105) (zza) of the Finance Act (Accounting Code -00440193). Identified under one accounting code.“
(102) “storage and warehousing” includes storage and warehousing services for goods including liquids and gases but does not include any service provided for storage of agricultural produce or any service provided by a cold storage;”
I mean to say agriculture produce was exempted for storage and warehouse in pre-GST era and GST regime.