Hey Bhavesh
As per Section 8(2) of IGST Act 2017 in case of supply of services where the location of the supplier and the place of supply of services are in the same State or same Union territory shall be treated as intra-State supply.
Further, for determining the Place of Supply in case of Fixed - Line Broadband Services the place of supply is determined as per section 12(11) of IGST Act 2017.
Extract of the section is as below-
The place of supply of telecommunication services including data transfer, broadcasting, cable and direct to home television services to any person shall,-
(a) in case of services by way of fixed telecommunication line, leased circuits, internet leased circuit, cable or dish antenna, be the location where the telecommunication line, leased circuit or cable connection or dish antenna is installed for receipt of services;
Therefore, in the current scenario the supply is Intra State Supply. Hence, CGST and SGST should be charged as State of Supplier and Place of Supplier is in the same State.